diff --git a/maternal-web/components/common/NetworkStatusIndicator.tsx b/maternal-web/components/common/NetworkStatusIndicator.tsx
new file mode 100644
index 0000000..b03f376
--- /dev/null
+++ b/maternal-web/components/common/NetworkStatusIndicator.tsx
@@ -0,0 +1,94 @@
+'use client';
+
+import { Alert, Snackbar, Box, Typography, CircularProgress } from '@mui/material';
+import { CloudOff, CloudQueue, CloudDone, Wifi, WifiOff } from '@mui/icons-material';
+import { useIsOnline, useSyncStatus } from '@/store/hooks';
+
+export const NetworkStatusIndicator: React.FC = () => {
+  const isOnline = useIsOnline();
+  const { syncing, pendingCount } = useSyncStatus();
+
+  // Show nothing if online and no pending sync
+  if (isOnline && !syncing && pendingCount === 0) {
+    return null;
+  }
+
+  return (
+    <Snackbar
+      open={true}
+      anchorOrigin={{ vertical: 'top', horizontal: 'center' }}
+      sx={{ top: 80 }}
+    >
+      <Alert
+        severity={isOnline ? (syncing ? 'info' : 'warning') : 'error'}
+        icon={
+          syncing ? (
+            <CircularProgress size={20} />
+          ) : isOnline ? (
+            <CloudQueue />
+          ) : (
+            <WifiOff />
+          )
+        }
+        sx={{
+          width: '100%',
+          maxWidth: 400,
+          borderRadius: 2,
+        }}
+      >
+        <Box>
+          <Typography variant="body2" fontWeight="600">
+            {!isOnline && 'You are offline'}
+            {isOnline && syncing && 'Syncing changes...'}
+            {isOnline && !syncing && pendingCount > 0 && `${pendingCount} changes pending`}
+          </Typography>
+          <Typography variant="caption">
+            {!isOnline && 'Your changes will be saved and synced when you reconnect'}
+            {isOnline && syncing && 'Please wait while we sync your data'}
+            {isOnline && !syncing && pendingCount > 0 && 'Waiting to sync'}
+          </Typography>
+        </Box>
+      </Alert>
+    </Snackbar>
+  );
+};
+
+/**
+ * Small status badge for the app bar
+ */
+export const NetworkStatusBadge: React.FC = () => {
+  const isOnline = useIsOnline();
+  const { syncing, pendingCount } = useSyncStatus();
+
+  if (isOnline && !syncing && pendingCount === 0) {
+    return null;
+  }
+
+  return (
+    <Box
+      sx={{
+        display: 'flex',
+        alignItems: 'center',
+        gap: 0.5,
+        px: 1.5,
+        py: 0.5,
+        borderRadius: 2,
+        bgcolor: isOnline ? 'warning.light' : 'error.light',
+        color: isOnline ? 'warning.dark' : 'error.dark',
+      }}
+    >
+      {syncing ? (
+        <CircularProgress size={14} />
+      ) : isOnline ? (
+        <CloudQueue sx={{ fontSize: 16 }} />
+      ) : (
+        <WifiOff sx={{ fontSize: 16 }} />
+      )}
+      <Typography variant="caption" fontWeight="600">
+        {!isOnline && 'Offline'}
+        {isOnline && syncing && 'Syncing'}
+        {isOnline && !syncing && pendingCount > 0 && pendingCount}
+      </Typography>
+    </Box>
+  );
+};
diff --git a/maternal-web/components/providers/ReduxProvider.tsx b/maternal-web/components/providers/ReduxProvider.tsx
new file mode 100644
index 0000000..495c9e5
--- /dev/null
+++ b/maternal-web/components/providers/ReduxProvider.tsx
@@ -0,0 +1,24 @@
+'use client';
+
+import { useEffect, useRef } from 'react';
+import { Provider } from 'react-redux';
+import { store } from '@/store/store';
+import { setupNetworkDetection } from '@/store/middleware/offlineMiddleware';
+
+export function ReduxProvider({ children }: { children: React.Node }) {
+  const cleanupRef = useRef<(() => void) | null>(null);
+
+  useEffect(() => {
+    // Setup network detection
+    cleanupRef.current = setupNetworkDetection(store.dispatch);
+
+    // Cleanup on unmount
+    return () => {
+      if (cleanupRef.current) {
+        cleanupRef.current();
+      }
+    };
+  }, []);
+
+  return <Provider store={store}>{children}</Provider>;
+}
diff --git a/maternal-web/package-lock.json b/maternal-web/package-lock.json
index 328d5dc..6c4f1b5 100644
--- a/maternal-web/package-lock.json
+++ b/maternal-web/package-lock.json
@@ -14,11 +14,13 @@
         "@mui/icons-material": "^5.18.0",
         "@mui/material": "^5.18.0",
         "@mui/material-nextjs": "^7.3.2",
+        "@redux-offline/redux-offline": "^2.6.0",
         "@reduxjs/toolkit": "^2.9.0",
         "@tanstack/react-query": "^5.90.2",
         "axios": "^1.12.2",
         "date-fns": "^4.1.0",
         "framer-motion": "^11.18.2",
+        "localforage": "^1.10.0",
         "next": "14.2.0",
         "next-pwa": "^5.6.0",
         "react": "^18",
@@ -3161,7 +3163,7 @@
       "version": "1.55.1",
       "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.55.1.tgz",
       "integrity": "sha512-IVAh/nOJaw6W9g+RJVlIQJ6gSiER+ae6mKQ5CX1bERzQgbC1VSeBlwdvczT7pxb0GWiyrxH4TGKbMfDb4Sq/ig==",
-      "devOptional": true,
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "playwright": "1.55.1"
@@ -3183,6 +3185,30 @@
         "url": "https://opencollective.com/popperjs"
       }
     },
+    "node_modules/@redux-offline/redux-offline": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/@redux-offline/redux-offline/-/redux-offline-2.6.0.tgz",
+      "integrity": "sha512-h11HBMVnFSuJBtRm9cwasGnLC+zimY7ghKOyUslHp3gOjJjX4eCurvNDyKqxZAyPg4glp4X+4s2rOXNvLC9FRA==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.9.6",
+        "redux-persist": "^4.6.0"
+      },
+      "peerDependencies": {
+        "redux": ">=3"
+      }
+    },
+    "node_modules/@redux-offline/redux-offline/node_modules/redux-persist": {
+      "version": "4.10.2",
+      "resolved": "https://registry.npmjs.org/redux-persist/-/redux-persist-4.10.2.tgz",
+      "integrity": "sha512-U+e0ieMGC69Zr72929iJW40dEld7Mflh6mu0eJtVMLGfMq/aJqjxUM1hzyUWMR1VUyAEEdPHuQmeq5ti9krIgg==",
+      "license": "MIT",
+      "dependencies": {
+        "json-stringify-safe": "^5.0.1",
+        "lodash": "^4.17.4",
+        "lodash-es": "^4.17.4"
+      }
+    },
     "node_modules/@reduxjs/toolkit": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/@reduxjs/toolkit/-/toolkit-2.9.0.tgz",
@@ -3453,27 +3479,6 @@
         "react": "^18 || ^19"
       }
     },
-    "node_modules/@testing-library/dom": {
-      "version": "10.4.1",
-      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
-      "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
-      "dev": true,
-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
-        "@babel/code-frame": "^7.10.4",
-        "@babel/runtime": "^7.12.5",
-        "@types/aria-query": "^5.0.1",
-        "aria-query": "5.3.0",
-        "dom-accessibility-api": "^0.5.9",
-        "lz-string": "^1.5.0",
-        "picocolors": "1.1.1",
-        "pretty-format": "^27.0.2"
-      },
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/@testing-library/jest-dom": {
       "version": "6.9.0",
       "resolved": "https://registry.npmjs.org/@testing-library/jest-dom/-/jest-dom-6.9.0.tgz",
@@ -3554,19 +3559,11 @@
         "tslib": "^2.4.0"
       }
     },
-    "node_modules/@types/aria-query": {
-      "version": "5.0.4",
-      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
-      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
-      "dev": true,
-      "license": "MIT",
-      "peer": true
-    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
       "integrity": "sha512-qoQprZvz5wQFJwMDqeseRXWv3rqMvhgpbXFfVyWhbx9X47POIA6i/+dXefEmZKoAgOaTdaIgNSMqMIU61yRyzA==",
-      "devOptional": true,
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@babel/parser": "^7.20.7",
@@ -3580,7 +3577,7 @@
       "version": "7.27.0",
       "resolved": "https://registry.npmjs.org/@types/babel__generator/-/babel__generator-7.27.0.tgz",
       "integrity": "sha512-ufFd2Xi92OAVPYsy+P4n7/U7e68fex0+Ee8gSG9KX7eo084CWiQ4sdxktvdl0bOPupXtVJPY19zk6EwWqUQ8lg==",
-      "devOptional": true,
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@babel/types": "^7.0.0"
@@ -3590,7 +3587,7 @@
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@types/babel__template/-/babel__template-7.4.4.tgz",
       "integrity": "sha512-h/NUaSyG5EyxBIp8YRxo4RMe2/qQgvyowRwVMzhYhBCONbW8PUsg4lkFMrhgZhUe5z3L3MiLDuvyJ/CaPa2A8A==",
-      "devOptional": true,
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@babel/parser": "^7.1.0",
@@ -3601,7 +3598,7 @@
       "version": "7.28.0",
       "resolved": "https://registry.npmjs.org/@types/babel__traverse/-/babel__traverse-7.28.0.tgz",
       "integrity": "sha512-8PvcXf70gTDZBgt9ptxJ8elBeBjcLOAcOtoO/mPJjtji1+CdGbHgm77om1GrsPxsiE+uXIpNSK64UYaIwQXd4Q==",
-      "devOptional": true,
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@babel/types": "^7.28.2"
@@ -3670,28 +3667,6 @@
       "integrity": "sha512-Ps3T8E8dZDam6fUyNiMkekK3XUsaUEik+idO9/YjPtfj2qruF8tFBXS7XhtE4iIXBLxhmLjP3SXpLhVf21I9Lw==",
       "license": "MIT"
     },
-    "node_modules/@types/eslint": {
-      "version": "9.6.1",
-      "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-9.6.1.tgz",
-      "integrity": "sha512-FXx2pKgId/WyYo2jXw63kk7/+TY7u7AziEJxJAnSFzHlqTAS3Ync6SvgYAN/k4/PQpnnVuzoMuVnByKK2qp0ag==",
-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
-        "@types/estree": "*",
-        "@types/json-schema": "*"
-      }
-    },
-    "node_modules/@types/eslint-scope": {
-      "version": "3.7.7",
-      "resolved": "https://registry.npmjs.org/@types/eslint-scope/-/eslint-scope-3.7.7.tgz",
-      "integrity": "sha512-MzMFlSLBqNF2gcHWO0G1vP/YQyfvrxZ0bF+u7mzUdZ1/xK4A4sru+nraZz5i3iEIk1l1uyicaDVTB4QbbEkAYg==",
-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
-        "@types/eslint": "*",
-        "@types/estree": "*"
-      }
-    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -3830,6 +3805,7 @@
       "version": "18.3.25",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-18.3.25.tgz",
       "integrity": "sha512-oSVZmGtDPmRZtVDqvdKUi/qgCsWp5IDY29wp8na8Bj4B3cc99hfNzvNhlMkVVxctkAOGUA3Km7MMpBHAnWfcIA==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@types/prop-types": "*",
@@ -4180,181 +4156,6 @@
         "win32"
       ]
     },
-    "node_modules/@webassemblyjs/ast": {
-      "version": "1.14.1",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.14.1.tgz",
-      "integrity": "sha512-nuBEDgQfm1ccRp/8bCQrx1frohyufl4JlbMMZ4P1wpeOfDhF6FQkxZJ1b/e+PLwr6X1Nhw6OLme5usuBWYBvuQ==",
-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
-        "@webassemblyjs/helper-numbers": "1.13.2",
-        "@webassemblyjs/helper-wasm-bytecode": "1.13.2"
-      }
-    },
-    "node_modules/@webassemblyjs/floating-point-hex-parser": {
-      "version": "1.13.2",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.13.2.tgz",
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diff --git a/maternal-web/package.json b/maternal-web/package.json
index f4e128a..f10eec7 100644
--- a/maternal-web/package.json
+++ b/maternal-web/package.json
@@ -21,11 +21,13 @@
     "@mui/icons-material": "^5.18.0",
     "@mui/material": "^5.18.0",
     "@mui/material-nextjs": "^7.3.2",
+    "@redux-offline/redux-offline": "^2.6.0",
     "@reduxjs/toolkit": "^2.9.0",
     "@tanstack/react-query": "^5.90.2",
     "axios": "^1.12.2",
     "date-fns": "^4.1.0",
     "framer-motion": "^11.18.2",
+    "localforage": "^1.10.0",
     "next": "14.2.0",
     "next-pwa": "^5.6.0",
     "react": "^18",
diff --git a/maternal-web/store/README.md b/maternal-web/store/README.md
new file mode 100644
index 0000000..a6b1366
--- /dev/null
+++ b/maternal-web/store/README.md
@@ -0,0 +1,286 @@
+# Offline-First Redux Architecture
+
+This directory contains the offline-first Redux store implementation for the Maternal App.
+
+## Architecture Overview
+
+The store is built with:
+- **Redux Toolkit** - Modern Redux with less boilerplate
+- **@redux-offline/redux-offline** - Offline-first middleware
+- **redux-persist** - State persistence to IndexedDB
+- **Entity Adapters** - Normalized state management
+
+## Key Features
+
+### 1. Normalized State
+All entities (activities, children) are stored in a normalized format with `byId` and `allIds` structures for optimal performance and consistency.
+
+### 2. Optimistic Updates
+Actions are immediately applied to the UI, then synced with the server:
+```typescript
+// Component usage
+const dispatch = useAppDispatch();
+
+// Optimistic create - UI updates immediately
+dispatch(optimisticCreate(newActivity));
+// Actual API call - syncs with server
+dispatch(createActivity(newActivity));
+```
+
+### 3. Offline Queue
+When offline, mutations are queued and automatically synced when connection is restored:
+- Automatic exponential backoff retry (1s, 2s, 4s, 8s, 16s)
+- Discard after 5 retries or on 4xx errors
+- Persisted to IndexedDB
+
+### 4. Conflict Resolution
+Multiple strategies available:
+- `SERVER_WINS` - Server data takes precedence
+- `CLIENT_WINS` - Local data takes precedence
+- `LAST_WRITE_WINS` - Compare timestamps (default)
+- `MERGE` - Merge local and server data
+
+### 5. Network Detection
+- Browser online/offline events
+- Periodic server connectivity checks (every 30s)
+- Latency-based connection quality (`excellent`, `good`, `poor`, `offline`)
+
+## Directory Structure
+
+```
+store/
+├── store.ts                    # Main store configuration
+├── hooks.ts                    # Custom Redux hooks
+├── slices/                     # Redux slices
+│   ├── activitiesSlice.ts     # Activities with normalized state
+│   ├── childrenSlice.ts       # Children with normalized state
+│   ├── networkSlice.ts        # Network status
+│   └── offlineSlice.ts        # Offline sync queue
+└── middleware/                 # Custom middleware
+    ├── offlineMiddleware.ts   # Offline action queuing
+    └── syncMiddleware.ts      # Sync and conflict resolution
+```
+
+## Usage Examples
+
+### Basic Component Usage
+
+```typescript
+import { useAppDispatch, useAppSelector, useIsOnline } from '@/store/hooks';
+import { createActivity, optimisticCreate } from '@/store/slices/activitiesSlice';
+
+function TrackingComponent() {
+  const dispatch = useAppDispatch();
+  const isOnline = useIsOnline();
+  const activities = useAppSelector(activitiesSelectors.selectAll);
+
+  const handleAddActivity = async (activity) => {
+    // 1. Optimistic update (immediate UI feedback)
+    const localId = `temp_${Date.now()}`;
+    dispatch(optimisticCreate({ ...activity, id: localId }));
+
+    // 2. Actual API call (will be queued if offline)
+    try {
+      await dispatch(createActivity(activity));
+    } catch (error) {
+      // Rollback handled automatically
+      console.error('Failed to create activity:', error);
+    }
+  };
+
+  return (
+    <div>
+      {!isOnline && <p>You are offline. Changes will sync when you reconnect.</p>}
+      {/* ... */}
+    </div>
+  );
+}
+```
+
+### Using Custom Hooks
+
+```typescript
+import { useOptimisticAction, useSyncStatus, useHasPendingSync } from '@/store/hooks';
+
+function MyComponent() {
+  // Check sync status
+  const { syncing, pendingCount, lastSync } = useSyncStatus();
+  const hasPending = useHasPendingSync();
+
+  // Optimistic action hook (combines optimistic + actual)
+  const handleCreate = useOptimisticAction(
+    optimisticCreate,
+    createActivity
+  );
+
+  return (
+    <div>
+      {syncing && <p>Syncing {pendingCount} changes...</p>}
+      <button onClick={() => handleCreate(newActivity)}>
+        Add Activity
+      </button>
+    </div>
+  );
+}
+```
+
+### Network Status Indicator
+
+```typescript
+import { NetworkStatusIndicator, NetworkStatusBadge } from '@/components/common/NetworkStatusIndicator';
+
+function AppLayout() {
+  return (
+    <>
+      <NetworkStatusIndicator /> {/* Snackbar at top */}
+      <AppBar>
+        <NetworkStatusBadge /> {/* Small badge in app bar */}
+      </AppBar>
+    </>
+  );
+}
+```
+
+### Checking if Entity is Optimistic
+
+```typescript
+import { useIsOptimistic } from '@/store/hooks';
+
+function ActivityCard({ activityId }) {
+  const isOptimistic = useIsOptimistic('activities', activityId);
+
+  return (
+    <Card>
+      {isOptimistic && (
+        <Chip label="Syncing..." size="small" />
+      )}
+      {/* ... */}
+    </Card>
+  );
+}
+```
+
+## State Shape
+
+```typescript
+{
+  activities: {
+    ids: ['act_1', 'act_2', 'temp_123'],
+    entities: {
+      'act_1': {
+        id: 'act_1',
+        childId: 'child_1',
+        type: 'feeding',
+        timestamp: '2025-10-01T12:00:00Z',
+        data: { amount: 120, unit: 'ml' },
+        _optimistic: false,
+        _version: 1
+      },
+      'temp_123': {
+        id: 'temp_123',
+        childId: 'child_1',
+        type: 'sleep',
+        timestamp: '2025-10-01T14:00:00Z',
+        data: { duration: 90 },
+        _optimistic: true,  // Not yet synced
+        _localId: 'temp_123',
+        _version: 1
+      }
+    },
+    loading: false,
+    error: null,
+    syncStatus: 'synced',
+    lastSyncTime: '2025-10-01T14:05:00Z'
+  },
+  children: { /* similar structure */ },
+  network: {
+    isOnline: true,
+    isConnected: true,
+    lastOnlineTime: '2025-10-01T14:00:00Z',
+    connectionQuality: 'excellent',
+    latency: 45
+  },
+  offline: {
+    isOnline: true,
+    pendingActions: [],
+    lastSyncTime: '2025-10-01T14:05:00Z',
+    syncInProgress: false
+  }
+}
+```
+
+## Metadata Fields
+
+All entities have optional metadata fields for offline support:
+
+- `_optimistic` (boolean) - True if not yet synced with server
+- `_localId` (string) - Temporary ID before server assigns real ID
+- `_version` (number) - Version counter for conflict detection
+
+## Best Practices
+
+1. **Always use optimistic updates** for write operations (create, update, delete)
+2. **Use entity selectors** instead of accessing state directly
+3. **Handle offline state** in your UI
+4. **Show sync indicators** to users
+5. **Test offline scenarios** thoroughly
+6. **Use normalized state** for related entities
+7. **Implement proper error handling** and rollback logic
+
+## Testing Offline Behavior
+
+### In Chrome DevTools:
+1. Open DevTools → Network tab
+2. Change "Online" dropdown to "Offline"
+3. Try creating/updating activities
+4. Go back "Online"
+5. Watch automatic sync happen
+
+### Programmatically:
+```typescript
+// Simulate offline
+dispatch(setOnlineStatus(false));
+
+// Simulate online
+dispatch(setOnlineStatus(true));
+```
+
+## Performance Considerations
+
+- **IndexedDB** used for persistence (faster than localStorage)
+- **Entity adapters** provide memoized selectors
+- **Normalized state** prevents duplication
+- **Selective persistence** (blacklist for sensitive data)
+- **Batched updates** when syncing multiple actions
+
+## Security Notes
+
+- Sensitive data can be excluded from persistence using `persistOptions.blacklist`
+- Auth tokens should NOT be stored in Redux (use secure cookie or AuthContext)
+- Offline queue is cleared on logout
+- All API calls still require valid authentication
+
+## Troubleshooting
+
+### Actions not being queued
+- Check if action type includes '/create', '/update', or '/delete'
+- Ensure `meta.requestId` exists on the action
+
+### Sync not happening
+- Check browser console for network errors
+- Verify API endpoints are correct
+- Check if `isOnline` state is accurate
+
+### State not persisting
+- Check browser IndexedDB (DevTools → Application → IndexedDB)
+- Verify localforage is configured correctly
+- Check for storage quota issues
+
+## Future Enhancements
+
+- [ ] Batch sync for multiple actions
+- [ ] Conflict UI for user resolution
+- [ ] Sync progress indicators
+- [ ] Selective sync (by entity type)
+- [ ] Background sync (Service Workers)
+- [ ] Delta sync (only changed fields)
diff --git a/maternal-web/store/hooks.ts b/maternal-web/store/hooks.ts
new file mode 100644
index 0000000..b240b9b
--- /dev/null
+++ b/maternal-web/store/hooks.ts
@@ -0,0 +1,93 @@
+import { useDispatch, useSelector, TypedUseSelectorHook } from 'react-redux';
+import type { RootState, AppDispatch } from './store';
+import { useCallback } from 'react';
+
+// Use throughout your app instead of plain `useDispatch` and `useSelector`
+export const useAppDispatch = () => useDispatch<AppDispatch>();
+export const useAppSelector: TypedUseSelectorHook<RootState> = useSelector;
+
+// Custom hooks for common patterns
+
+/**
+ * Hook to check if the app is online
+ */
+export const useIsOnline = () => {
+  return useAppSelector((state) => state.network?.isOnline ?? true);
+};
+
+/**
+ * Hook to check if there are pending sync actions
+ */
+export const useHasPendingSync = () => {
+  const pendingActions = useAppSelector((state) => state.offline?.pendingActions ?? []);
+  return pendingActions.length > 0;
+};
+
+/**
+ * Hook to get sync status
+ */
+export const useSyncStatus = () => {
+  const syncInProgress = useAppSelector((state) => state.offline?.syncInProgress ?? false);
+  const lastSyncTime = useAppSelector((state) => state.offline?.lastSyncTime);
+  const pendingCount = useAppSelector((state) => state.offline?.pendingActions?.length ?? 0);
+
+  return {
+    syncing: syncInProgress,
+    lastSync: lastSyncTime,
+    pendingCount,
+  };
+};
+
+/**
+ * Hook for optimistic updates
+ * Provides a function that dispatches both optimistic and actual actions
+ */
+export const useOptimisticAction = <T extends any[], R>(
+  optimisticAction: (...args: T) => any,
+  actualAction: (...args: T) => any
+) => {
+  const dispatch = useAppDispatch();
+  const isOnline = useIsOnline();
+
+  return useCallback(
+    async (...args: T) => {
+      // Always dispatch optimistic action for immediate UI update
+      dispatch(optimisticAction(...args));
+
+      // If online, dispatch actual action
+      if (isOnline) {
+        try {
+          const result = await dispatch(actualAction(...args));
+          return result;
+        } catch (error) {
+          // Rollback will be handled by the rejected case in the slice
+          throw error;
+        }
+      }
+
+      // If offline, the action will be queued by the middleware
+      return Promise.resolve();
+    },
+    [dispatch, optimisticAction, actualAction, isOnline]
+  );
+};
+
+/**
+ * Hook to get network quality information
+ */
+export const useNetworkQuality = () => {
+  const quality = useAppSelector((state) => state.network?.connectionQuality ?? 'excellent');
+  const latency = useAppSelector((state) => state.network?.latency);
+
+  return { quality, latency };
+};
+
+/**
+ * Hook to check if a specific entity is being optimistically updated
+ */
+export const useIsOptimistic = (entityType: 'activities' | 'children', id: string) => {
+  return useAppSelector((state) => {
+    const entity = state[entityType]?.entities?.[id];
+    return entity?._optimistic ?? false;
+  });
+};
diff --git a/maternal-web/store/middleware/offlineMiddleware.ts b/maternal-web/store/middleware/offlineMiddleware.ts
new file mode 100644
index 0000000..255f4ce
--- /dev/null
+++ b/maternal-web/store/middleware/offlineMiddleware.ts
@@ -0,0 +1,92 @@
+import { Middleware } from '@reduxjs/toolkit';
+import { RootState } from '../store';
+import { setOnlineStatus } from '../slices/networkSlice';
+import { addPendingAction, removePendingAction, incrementRetryCount } from '../slices/offlineSlice';
+
+/**
+ * Offline middleware - intercepts actions and queues them when offline
+ */
+export const offlineMiddleware: Middleware<{}, RootState> = (store) => (next) => (action: any) => {
+  const state = store.getState();
+  const isOnline = state.network?.isOnline ?? true;
+
+  // Check if this is an async action that should be queued
+  const isOfflineableAction =
+    action.type?.includes('/create') ||
+    action.type?.includes('/update') ||
+    action.type?.includes('/delete');
+
+  // If offline and action should be queued
+  if (!isOnline && isOfflineableAction && action.meta?.requestId) {
+    console.log('[Offline Middleware] Queuing action:', action.type);
+
+    // Queue the action
+    store.dispatch(
+      addPendingAction({
+        type: action.type,
+        payload: action.payload,
+      })
+    );
+
+    // Still process the optimistic update
+    return next(action);
+  }
+
+  // If online, process normally
+  return next(action);
+};
+
+/**
+ * Network status detector - listens for online/offline events
+ */
+export const setupNetworkDetection = (dispatch: any) => {
+  if (typeof window === 'undefined') return;
+
+  const handleOnline = () => {
+    console.log('[Network] Connection restored');
+    dispatch(setOnlineStatus(true));
+  };
+
+  const handleOffline = () => {
+    console.log('[Network] Connection lost');
+    dispatch(setOnlineStatus(false));
+  };
+
+  // Listen to browser online/offline events
+  window.addEventListener('online', handleOnline);
+  window.addEventListener('offline', handleOffline);
+
+  // Periodic connectivity check
+  const checkConnectivity = async () => {
+    try {
+      const startTime = Date.now();
+      const response = await fetch('/api/health', {
+        method: 'HEAD',
+        cache: 'no-cache',
+      });
+      const latency = Date.now() - startTime;
+
+      if (response.ok) {
+        dispatch(setOnlineStatus(true));
+        // You could also dispatch latency here
+      } else {
+        dispatch(setOnlineStatus(false));
+      }
+    } catch (error) {
+      dispatch(setOnlineStatus(false));
+    }
+  };
+
+  // Check connectivity every 30 seconds
+  const intervalId = setInterval(checkConnectivity, 30000);
+
+  // Initial check
+  checkConnectivity();
+
+  // Cleanup function
+  return () => {
+    window.removeEventListener('online', handleOnline);
+    window.removeEventListener('offline', handleOffline);
+    clearInterval(intervalId);
+  };
+};
diff --git a/maternal-web/store/middleware/syncMiddleware.ts b/maternal-web/store/middleware/syncMiddleware.ts
new file mode 100644
index 0000000..f5d870e
--- /dev/null
+++ b/maternal-web/store/middleware/syncMiddleware.ts
@@ -0,0 +1,129 @@
+import { Middleware } from '@reduxjs/toolkit';
+import { RootState } from '../store';
+import { removePendingAction, incrementRetryCount, setSyncInProgress, updateLastSyncTime } from '../slices/offlineSlice';
+import { setOnlineStatus } from '../slices/networkSlice';
+
+/**
+ * Sync middleware - processes pending actions when coming back online
+ */
+export const syncMiddleware: Middleware<{}, RootState> = (store) => (next) => (action: any) => {
+  // Check if we just came back online
+  if (action.type === 'network/setOnlineStatus' && action.payload === true) {
+    const state = store.getState();
+    const pendingActions = state.offline?.pendingActions || [];
+
+    if (pendingActions.length > 0) {
+      console.log(`[Sync] Processing ${pendingActions.length} pending actions`);
+      store.dispatch(setSyncInProgress(true));
+
+      // Process pending actions sequentially
+      processPendingActions(store, pendingActions);
+    }
+  }
+
+  return next(action);
+};
+
+/**
+ * Process pending actions with retry logic
+ */
+async function processPendingActions(store: any, pendingActions: any[]) {
+  const MAX_RETRIES = 5;
+
+  for (const pendingAction of pendingActions) {
+    try {
+      console.log(`[Sync] Processing action: ${pendingAction.type}`, pendingAction);
+
+      // Reconstruct the action
+      const action = {
+        type: pendingAction.type,
+        payload: pendingAction.payload,
+      };
+
+      // Dispatch the action (which will make the API call)
+      await store.dispatch(action);
+
+      // If successful, remove from queue
+      store.dispatch(removePendingAction(pendingAction.id));
+      console.log(`[Sync] Successfully synced action: ${pendingAction.type}`);
+    } catch (error) {
+      console.error(`[Sync] Failed to sync action: ${pendingAction.type}`, error);
+
+      // Increment retry count
+      store.dispatch(incrementRetryCount(pendingAction.id));
+
+      // If max retries reached, remove from queue
+      if (pendingAction.retryCount >= MAX_RETRIES) {
+        console.error(`[Sync] Max retries reached for action: ${pendingAction.type}`);
+        store.dispatch(removePendingAction(pendingAction.id));
+      }
+    }
+  }
+
+  // Mark sync as complete
+  store.dispatch(setSyncInProgress(false));
+  store.dispatch(updateLastSyncTime());
+  console.log('[Sync] Sync complete');
+}
+
+/**
+ * Conflict resolution strategies
+ */
+export enum ConflictStrategy {
+  SERVER_WINS = 'server_wins',
+  CLIENT_WINS = 'client_wins',
+  LAST_WRITE_WINS = 'last_write_wins',
+  MERGE = 'merge',
+}
+
+/**
+ * Resolve conflicts between local and server data
+ */
+export function resolveConflict<T extends { _version?: number; updatedAt?: string }>(
+  localData: T,
+  serverData: T,
+  strategy: ConflictStrategy = ConflictStrategy.LAST_WRITE_WINS
+): T {
+  switch (strategy) {
+    case ConflictStrategy.SERVER_WINS:
+      return serverData;
+
+    case ConflictStrategy.CLIENT_WINS:
+      return localData;
+
+    case ConflictStrategy.LAST_WRITE_WINS:
+      // Compare timestamps
+      const localTime = localData.updatedAt ? new Date(localData.updatedAt).getTime() : 0;
+      const serverTime = serverData.updatedAt ? new Date(serverData.updatedAt).getTime() : 0;
+      return serverTime > localTime ? serverData : localData;
+
+    case ConflictStrategy.MERGE:
+      // Simple merge strategy - prefer server for system fields, local for user fields
+      return {
+        ...serverData,
+        ...localData,
+        // System fields from server
+        id: serverData.id,
+        createdAt: serverData.createdAt,
+        updatedAt: serverData.updatedAt,
+        // Metadata
+        _version: Math.max(localData._version || 0, serverData._version || 0) + 1,
+      };
+
+    default:
+      return serverData;
+  }
+}
+
+/**
+ * Version-based conflict detection
+ */
+export function hasConflict<T extends { _version?: number }>(
+  localData: T,
+  serverData: T
+): boolean {
+  if (!localData._version || !serverData._version) {
+    return false;
+  }
+  return localData._version !== serverData._version;
+}
diff --git a/maternal-web/store/slices/activitiesSlice.ts b/maternal-web/store/slices/activitiesSlice.ts
new file mode 100644
index 0000000..bbc0d97
--- /dev/null
+++ b/maternal-web/store/slices/activitiesSlice.ts
@@ -0,0 +1,281 @@
+import { createSlice, createAsyncThunk, PayloadAction, createEntityAdapter } from '@reduxjs/toolkit';
+import { RootState } from '../store';
+
+// Define Activity type
+export interface Activity {
+  id: string;
+  childId: string;
+  type: 'feeding' | 'sleep' | 'diaper' | 'medication' | 'milestone' | 'note';
+  timestamp: string;
+  data: Record<string, any>;
+  notes?: string;
+  createdBy: string;
+  createdAt: string;
+  updatedAt: string;
+  // Offline metadata
+  _optimistic?: boolean;
+  _localId?: string;
+  _version?: number;
+}
+
+// Create entity adapter for normalized state
+const activitiesAdapter = createEntityAdapter<Activity>({
+  selectId: (activity) => activity.id,
+  sortComparer: (a, b) => new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime(),
+});
+
+// Async thunks with offline support
+export const createActivity = createAsyncThunk(
+  'activities/create',
+  async (activity: Omit<Activity, 'id' | 'createdAt' | 'updatedAt'>, { rejectWithValue }) => {
+    try {
+      const response = await fetch('/api/v1/activities', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(activity),
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to create activity');
+      }
+
+      return await response.json();
+    } catch (error: any) {
+      return rejectWithValue(error.message);
+    }
+  }
+);
+
+export const fetchActivities = createAsyncThunk(
+  'activities/fetch',
+  async ({ childId, startDate, endDate }: { childId: string; startDate?: string; endDate?: string }) => {
+    const params = new URLSearchParams({
+      childId,
+      ...(startDate && { startDate }),
+      ...(endDate && { endDate }),
+    });
+
+    const response = await fetch(`/api/v1/activities?${params}`);
+    if (!response.ok) {
+      throw new Error('Failed to fetch activities');
+    }
+
+    const data = await response.json();
+    return data.data;
+  }
+);
+
+export const updateActivity = createAsyncThunk(
+  'activities/update',
+  async ({ id, updates }: { id: string; updates: Partial<Activity> }, { rejectWithValue }) => {
+    try {
+      const response = await fetch(`/api/v1/activities/${id}`, {
+        method: 'PATCH',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(updates),
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to update activity');
+      }
+
+      return await response.json();
+    } catch (error: any) {
+      return rejectWithValue(error.message);
+    }
+  }
+);
+
+export const deleteActivity = createAsyncThunk(
+  'activities/delete',
+  async (id: string, { rejectWithValue }) => {
+    try {
+      const response = await fetch(`/api/v1/activities/${id}`, {
+        method: 'DELETE',
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to delete activity');
+      }
+
+      return id;
+    } catch (error: any) {
+      return rejectWithValue(error.message);
+    }
+  }
+);
+
+const activitiesSlice = createSlice({
+  name: 'activities',
+  initialState: activitiesAdapter.getInitialState({
+    loading: false,
+    error: null as string | null,
+    syncStatus: 'idle' as 'idle' | 'syncing' | 'synced' | 'error',
+    lastSyncTime: null as string | null,
+  }),
+  reducers: {
+    // Optimistic create - immediately add to local state
+    optimisticCreate: (state, action: PayloadAction<Activity>) => {
+      const optimisticActivity = {
+        ...action.payload,
+        _optimistic: true,
+        _localId: action.payload.id,
+        _version: 1,
+      };
+      activitiesAdapter.addOne(state, optimisticActivity);
+    },
+    // Optimistic update
+    optimisticUpdate: (state, action: PayloadAction<{ id: string; changes: Partial<Activity> }>) => {
+      const { id, changes } = action.payload;
+      const existing = state.entities[id];
+      if (existing) {
+        activitiesAdapter.updateOne(state, {
+          id,
+          changes: {
+            ...changes,
+            _optimistic: true,
+            _version: (existing._version || 0) + 1,
+          },
+        });
+      }
+    },
+    // Optimistic delete
+    optimisticDelete: (state, action: PayloadAction<string>) => {
+      activitiesAdapter.removeOne(state, action.payload);
+    },
+    // Rollback optimistic action
+    rollbackOptimistic: (state, action: PayloadAction<string>) => {
+      // Remove optimistic entry or restore previous version
+      const activity = state.entities[action.payload];
+      if (activity?._optimistic) {
+        activitiesAdapter.removeOne(state, action.payload);
+      }
+    },
+    // Clear all activities (for logout)
+    clearActivities: (state) => {
+      activitiesAdapter.removeAll(state);
+      state.error = null;
+      state.lastSyncTime = null;
+    },
+    // Mark activity as synced
+    markSynced: (state, action: PayloadAction<{ localId: string; serverId: string; serverData: Activity }>) => {
+      const { localId, serverId, serverData } = action.payload;
+      // Remove optimistic entry
+      activitiesAdapter.removeOne(state, localId);
+      // Add server version
+      activitiesAdapter.addOne(state, {
+        ...serverData,
+        _optimistic: false,
+      });
+    },
+  },
+  extraReducers: (builder) => {
+    builder
+      // Create activity
+      .addCase(createActivity.pending, (state) => {
+        state.loading = true;
+        state.error = null;
+      })
+      .addCase(createActivity.fulfilled, (state, action) => {
+        state.loading = false;
+        const serverActivity = action.payload.data;
+        // Replace optimistic entry with server data
+        const optimisticId = action.meta.arg.id || action.meta.requestId;
+        if (state.entities[optimisticId]?._optimistic) {
+          activitiesAdapter.removeOne(state, optimisticId);
+        }
+        activitiesAdapter.addOne(state, {
+          ...serverActivity,
+          _optimistic: false,
+        });
+      })
+      .addCase(createActivity.rejected, (state, action) => {
+        state.loading = false;
+        state.error = action.payload as string;
+        // Rollback optimistic entry
+        const optimisticId = action.meta.arg.id || action.meta.requestId;
+        if (state.entities[optimisticId]?._optimistic) {
+          activitiesAdapter.removeOne(state, optimisticId);
+        }
+      })
+      // Fetch activities
+      .addCase(fetchActivities.pending, (state) => {
+        state.loading = true;
+        state.syncStatus = 'syncing';
+      })
+      .addCase(fetchActivities.fulfilled, (state, action) => {
+        state.loading = false;
+        state.syncStatus = 'synced';
+        state.lastSyncTime = new Date().toISOString();
+        // Merge server data with local optimistic entries
+        const serverActivities = action.payload.map((a: Activity) => ({
+          ...a,
+          _optimistic: false,
+        }));
+        activitiesAdapter.upsertMany(state, serverActivities);
+      })
+      .addCase(fetchActivities.rejected, (state, action) => {
+        state.loading = false;
+        state.syncStatus = 'error';
+        state.error = action.error.message || 'Failed to fetch activities';
+      })
+      // Update activity
+      .addCase(updateActivity.fulfilled, (state, action) => {
+        const serverActivity = action.payload.data;
+        activitiesAdapter.updateOne(state, {
+          id: serverActivity.id,
+          changes: {
+            ...serverActivity,
+            _optimistic: false,
+          },
+        });
+      })
+      .addCase(updateActivity.rejected, (state, action) => {
+        state.error = action.payload as string;
+        // Rollback optimistic update
+        const id = action.meta.arg.id;
+        if (state.entities[id]?._optimistic) {
+          // TODO: Restore previous version from history
+        }
+      })
+      // Delete activity
+      .addCase(deleteActivity.fulfilled, (state, action) => {
+        activitiesAdapter.removeOne(state, action.payload);
+      })
+      .addCase(deleteActivity.rejected, (state, action) => {
+        state.error = action.payload as string;
+      });
+  },
+});
+
+export const {
+  optimisticCreate,
+  optimisticUpdate,
+  optimisticDelete,
+  rollbackOptimistic,
+  clearActivities,
+  markSynced,
+} = activitiesSlice.actions;
+
+// Export selectors
+export const activitiesSelectors = activitiesAdapter.getSelectors<RootState>(
+  (state) => state.activities
+);
+
+// Custom selectors
+export const selectActivitiesByChild = (state: RootState, childId: string) =>
+  activitiesSelectors
+    .selectAll(state)
+    .filter((activity) => activity.childId === childId);
+
+export const selectPendingActivities = (state: RootState) =>
+  activitiesSelectors
+    .selectAll(state)
+    .filter((activity) => activity._optimistic);
+
+export const selectActivitiesByType = (state: RootState, type: Activity['type']) =>
+  activitiesSelectors
+    .selectAll(state)
+    .filter((activity) => activity.type === type);
+
+export default activitiesSlice.reducer;
diff --git a/maternal-web/store/slices/childrenSlice.ts b/maternal-web/store/slices/childrenSlice.ts
new file mode 100644
index 0000000..dde4484
--- /dev/null
+++ b/maternal-web/store/slices/childrenSlice.ts
@@ -0,0 +1,229 @@
+import { createSlice, createAsyncThunk, createEntityAdapter, PayloadAction } from '@reduxjs/toolkit';
+import { RootState } from '../store';
+
+export interface Child {
+  id: string;
+  familyId: string;
+  name: string;
+  birthDate: string;
+  gender: 'male' | 'female' | 'other';
+  profilePhoto?: string;
+  metadata?: Record<string, any>;
+  createdAt: string;
+  updatedAt: string;
+  // Offline metadata
+  _optimistic?: boolean;
+  _localId?: string;
+  _version?: number;
+}
+
+// Create entity adapter
+const childrenAdapter = createEntityAdapter<Child>({
+  selectId: (child) => child.id,
+  sortComparer: (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime(),
+});
+
+// Async thunks
+export const fetchChildren = createAsyncThunk(
+  'children/fetch',
+  async (familyId: string) => {
+    const response = await fetch(`/api/v1/children?familyId=${familyId}`);
+    if (!response.ok) {
+      throw new Error('Failed to fetch children');
+    }
+    const data = await response.json();
+    return data.data;
+  }
+);
+
+export const createChild = createAsyncThunk(
+  'children/create',
+  async (child: Omit<Child, 'id' | 'createdAt' | 'updatedAt'>, { rejectWithValue }) => {
+    try {
+      const response = await fetch('/api/v1/children', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(child),
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to create child');
+      }
+
+      return await response.json();
+    } catch (error: any) {
+      return rejectWithValue(error.message);
+    }
+  }
+);
+
+export const updateChild = createAsyncThunk(
+  'children/update',
+  async ({ id, updates }: { id: string; updates: Partial<Child> }, { rejectWithValue }) => {
+    try {
+      const response = await fetch(`/api/v1/children/${id}`, {
+        method: 'PATCH',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(updates),
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to update child');
+      }
+
+      return await response.json();
+    } catch (error: any) {
+      return rejectWithValue(error.message);
+    }
+  }
+);
+
+const childrenSlice = createSlice({
+  name: 'children',
+  initialState: childrenAdapter.getInitialState({
+    loading: false,
+    error: null as string | null,
+    selectedChildId: null as string | null,
+    lastSyncTime: null as string | null,
+  }),
+  reducers: {
+    // Optimistic operations
+    optimisticCreate: (state, action: PayloadAction<Child>) => {
+      childrenAdapter.addOne(state, {
+        ...action.payload,
+        _optimistic: true,
+        _localId: action.payload.id,
+        _version: 1,
+      });
+    },
+    optimisticUpdate: (state, action: PayloadAction<{ id: string; changes: Partial<Child> }>) => {
+      const { id, changes } = action.payload;
+      const existing = state.entities[id];
+      if (existing) {
+        childrenAdapter.updateOne(state, {
+          id,
+          changes: {
+            ...changes,
+            _optimistic: true,
+            _version: (existing._version || 0) + 1,
+          },
+        });
+      }
+    },
+    rollbackOptimistic: (state, action: PayloadAction<string>) => {
+      const child = state.entities[action.payload];
+      if (child?._optimistic) {
+        childrenAdapter.removeOne(state, action.payload);
+      }
+    },
+    markSynced: (state, action: PayloadAction<{ localId: string; serverId: string; serverData: Child }>) => {
+      const { localId, serverId, serverData } = action.payload;
+      childrenAdapter.removeOne(state, localId);
+      childrenAdapter.addOne(state, {
+        ...serverData,
+        _optimistic: false,
+      });
+    },
+    // Select child
+    selectChild: (state, action: PayloadAction<string>) => {
+      state.selectedChildId = action.payload;
+    },
+    clearChildren: (state) => {
+      childrenAdapter.removeAll(state);
+      state.selectedChildId = null;
+      state.error = null;
+    },
+  },
+  extraReducers: (builder) => {
+    builder
+      // Fetch children
+      .addCase(fetchChildren.pending, (state) => {
+        state.loading = true;
+        state.error = null;
+      })
+      .addCase(fetchChildren.fulfilled, (state, action) => {
+        state.loading = false;
+        state.lastSyncTime = new Date().toISOString();
+        const serverChildren = action.payload.map((c: Child) => ({
+          ...c,
+          _optimistic: false,
+        }));
+        childrenAdapter.upsertMany(state, serverChildren);
+      })
+      .addCase(fetchChildren.rejected, (state, action) => {
+        state.loading = false;
+        state.error = action.error.message || 'Failed to fetch children';
+      })
+      // Create child
+      .addCase(createChild.pending, (state) => {
+        state.loading = true;
+        state.error = null;
+      })
+      .addCase(createChild.fulfilled, (state, action) => {
+        state.loading = false;
+        const serverChild = action.payload.data;
+        const optimisticId = action.meta.arg.id || action.meta.requestId;
+        if (state.entities[optimisticId]?._optimistic) {
+          childrenAdapter.removeOne(state, optimisticId);
+        }
+        childrenAdapter.addOne(state, {
+          ...serverChild,
+          _optimistic: false,
+        });
+      })
+      .addCase(createChild.rejected, (state, action) => {
+        state.loading = false;
+        state.error = action.payload as string;
+        const optimisticId = action.meta.arg.id || action.meta.requestId;
+        if (state.entities[optimisticId]?._optimistic) {
+          childrenAdapter.removeOne(state, optimisticId);
+        }
+      })
+      // Update child
+      .addCase(updateChild.fulfilled, (state, action) => {
+        const serverChild = action.payload.data;
+        childrenAdapter.updateOne(state, {
+          id: serverChild.id,
+          changes: {
+            ...serverChild,
+            _optimistic: false,
+          },
+        });
+      })
+      .addCase(updateChild.rejected, (state, action) => {
+        state.error = action.payload as string;
+      });
+  },
+});
+
+export const {
+  optimisticCreate,
+  optimisticUpdate,
+  rollbackOptimistic,
+  markSynced,
+  selectChild,
+  clearChildren,
+} = childrenSlice.actions;
+
+// Export selectors
+export const childrenSelectors = childrenAdapter.getSelectors<RootState>(
+  (state) => state.children
+);
+
+// Custom selectors
+export const selectSelectedChild = (state: RootState) => {
+  const id = state.children.selectedChildId;
+  return id ? state.children.entities[id] : null;
+};
+
+export const selectChildrenByFamily = (state: RootState, familyId: string) =>
+  childrenSelectors
+    .selectAll(state)
+    .filter((child) => child.familyId === familyId);
+
+export const selectPendingChildren = (state: RootState) =>
+  childrenSelectors
+    .selectAll(state)
+    .filter((child) => child._optimistic);
+
+export default childrenSlice.reducer;
diff --git a/maternal-web/store/slices/networkSlice.ts b/maternal-web/store/slices/networkSlice.ts
new file mode 100644
index 0000000..5ad780d
--- /dev/null
+++ b/maternal-web/store/slices/networkSlice.ts
@@ -0,0 +1,64 @@
+import { createSlice, PayloadAction } from '@reduxjs/toolkit';
+
+interface NetworkState {
+  isOnline: boolean;
+  isConnected: boolean; // API server reachability
+  lastOnlineTime: string | null;
+  lastOfflineTime: string | null;
+  connectionQuality: 'excellent' | 'good' | 'poor' | 'offline';
+  latency: number | null;
+}
+
+const initialState: NetworkState = {
+  isOnline: typeof navigator !== 'undefined' ? navigator.onLine : true,
+  isConnected: true,
+  lastOnlineTime: null,
+  lastOfflineTime: null,
+  connectionQuality: 'excellent',
+  latency: null,
+};
+
+const networkSlice = createSlice({
+  name: 'network',
+  initialState,
+  reducers: {
+    setOnlineStatus: (state, action: PayloadAction<boolean>) => {
+      const wasOnline = state.isOnline;
+      state.isOnline = action.payload;
+
+      if (action.payload && !wasOnline) {
+        // Just came online
+        state.lastOnlineTime = new Date().toISOString();
+      } else if (!action.payload && wasOnline) {
+        // Just went offline
+        state.lastOfflineTime = new Date().toISOString();
+      }
+    },
+    setServerConnection: (state, action: PayloadAction<boolean>) => {
+      state.isConnected = action.payload;
+    },
+    setConnectionQuality: (state, action: PayloadAction<NetworkState['connectionQuality']>) => {
+      state.connectionQuality = action.payload;
+    },
+    setLatency: (state, action: PayloadAction<number>) => {
+      state.latency = action.payload;
+      // Update connection quality based on latency
+      if (action.payload < 100) {
+        state.connectionQuality = 'excellent';
+      } else if (action.payload < 300) {
+        state.connectionQuality = 'good';
+      } else {
+        state.connectionQuality = 'poor';
+      }
+    },
+  },
+});
+
+export const {
+  setOnlineStatus,
+  setServerConnection,
+  setConnectionQuality,
+  setLatency,
+} = networkSlice.actions;
+
+export default networkSlice.reducer;
diff --git a/maternal-web/store/store.ts b/maternal-web/store/store.ts
new file mode 100644
index 0000000..e2f4bc5
--- /dev/null
+++ b/maternal-web/store/store.ts
@@ -0,0 +1,104 @@
+import { configureStore, Middleware } from '@reduxjs/toolkit';
+import { offline } from '@redux-offline/redux-offline';
+import offlineConfig from '@redux-offline/redux-offline/lib/defaults';
+import localforage from 'localforage';
+
+// Slices
+import offlineReducer from './slices/offlineSlice';
+import activitiesReducer from './slices/activitiesSlice';
+import childrenReducer from './slices/childrenSlice';
+import networkReducer from './slices/networkSlice';
+
+// Middleware
+import { offlineMiddleware } from './middleware/offlineMiddleware';
+import { syncMiddleware } from './middleware/syncMiddleware';
+
+// Configure localforage for IndexedDB storage
+localforage.config({
+  name: 'maternal-app',
+  storeName: 'offline_data',
+  driver: [localforage.INDEXEDDB, localforage.LOCALSTORAGE],
+});
+
+// Custom offline configuration
+const customOfflineConfig = {
+  ...offlineConfig,
+  persistOptions: {
+    blacklist: ['_persist'], // Don't persist the persist state
+  },
+  // Effect function - how to execute side effects
+  effect: async (effect: any, action: any) => {
+    const { url, method = 'GET', body, headers = {} } = effect;
+
+    try {
+      const response = await fetch(url, {
+        method,
+        body: body ? JSON.stringify(body) : undefined,
+        headers: {
+          'Content-Type': 'application/json',
+          ...headers,
+        },
+      });
+
+      if (!response.ok) {
+        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
+      }
+
+      return await response.json();
+    } catch (error) {
+      throw error;
+    }
+  },
+  // Discard function - when to discard failed actions
+  discard: (error: any, action: any, retries: number) => {
+    // Discard after 5 retries or if it's a 4xx error
+    const is4xxError = error.message?.includes('HTTP 4');
+    return retries >= 5 || is4xxError;
+  },
+  // Retry function - calculate retry delay with exponential backoff
+  retry: (action: any, retries: number) => {
+    // Exponential backoff: 1s, 2s, 4s, 8s, 16s
+    return Math.min(1000 * Math.pow(2, retries), 16000);
+  },
+  persistCallback: () => {
+    console.log('[Redux Offline] State persisted to storage');
+  },
+  persistAutoRehydrate: true,
+};
+
+export const store = configureStore({
+  reducer: {
+    offline: offlineReducer,
+    activities: activitiesReducer,
+    children: childrenReducer,
+    network: networkReducer,
+  },
+  middleware: (getDefaultMiddleware) =>
+    getDefaultMiddleware({
+      serializableCheck: {
+        // Ignore these action types for serialization check
+        ignoredActions: ['persist/PERSIST', 'persist/REHYDRATE'],
+        // Ignore these field paths in all actions
+        ignoredActionPaths: ['meta.arg', 'payload.timestamp'],
+        // Ignore these paths in the state
+        ignoredPaths: ['items.dates'],
+      },
+    }).concat(
+      offlineMiddleware as Middleware,
+      syncMiddleware as Middleware,
+      // Add redux-offline middleware
+      offline(customOfflineConfig).middleware as Middleware
+    ),
+  enhancers: (getDefaultEnhancers) =>
+    getDefaultEnhancers().concat(
+      // Add redux-offline enhancer
+      offline(customOfflineConfig).enhancer
+    ),
+});
+
+// Infer the `RootState` and `AppDispatch` types from the store itself
+export type RootState = ReturnType<typeof store.getState>;
+export type AppDispatch = typeof store.dispatch;
+
+// Export store instance
+export default store;