Hi there,

Child accounts are restricted accounts for users under 13 years of age partly due to online privacy protection laws for children. For information on how child accounts are different from regular accounts, please see this article: https://support.khanacademy.org/hc/en-us/articles/202262974-How-are-child-restricted-accounts-different-from-regular-accounts- 

I hope this helps! Please let me know if you have any further questions.