With set up a device for a child, you can customize parental controls from the start. You can change those settings at any time.
Follow the onscreen instructions during setup to add any of the following:
Age-related restrictions for content in apps, books, TV shows, and movies
Downtime and limits for specific apps
Restrictions for who your child can communicate with
Approvals for purchases or free downloads
See the Apple Support article System Requirements for iCloud.
Go to Settings > Screen Time or in Messages Use Apple Cash and Apple Card with Family Sharing (U.S. only).