Email notifications have been really simplified. It is now possible to have a different preference for ‘My Children’ and ‘Other Children’ and for each, you can select which new content type you’d like an email for - Likes, Comments, Uploads
Step 1: Tap on the menu button (circled below)
Step 2: Tap on ‘Manage Notifications’
Step 3: Tap on ‘Email’
Step 4: Toggle notification type ON/OFF (by default emails are sent immediately)
Additionally, you can set the frequency of Timeline Highlights email.
Step 5: Tap on the ‘Frequency’ setting
Step 6: Select your preference