With Family Sharing, the organizer, a parent, or a guardian can use Quick Start on their iPhone to set up a new iPhone or iPad for a child and customize parental controls. You can also set up a device for a child without using Quick Start.
If you didn’t sign in to a child’s account when you set up their device, you can do so in Settings with their Apple Account and password, or by using proximity sign-in with a nearby iPhone or iPad.
Note: If the child already has an Apple Account, make sure they’ve been added to your , then sign in to your Apple Account on your iPhone.
On the new iPhone or iPad you want to set up for your child, press and hold the side button or top button until the Apple logo appears.
Bring your iPhone next to the new device.
When you see Set Up New [device] on your iPhone, tap Continue, follow the onscreen instructions, then do one of the following:
If you have a child in your family group, tap your child’s name.
If you need to create a new Apple Account for a child Set up Screen Time on iPhoneApple Support article: Approve what kids buy with Ask to Buy