Young children may not have a phone so they may not be able to have an account for themselves (because it requires an Apple/Google ID). So we gave parents the ability to track their child's health data through their own app.
To use this feature, go to Settings → Family.
Here you can create a child account to be able to seamlessly track your children’s health indexes. To do so, go to “+” and fill your child’s information. Then click on “Save” to create the account.
In this “Family” section, you can switch between accounts. When you select one, you see all the information and the measurement history of the selected account.