On first login, each child (mine is 6 years old, mind you) gets a 13 icon pictographic string assigned to them. The icons are stuff like “bear” or “apple” or “drum” along with letters and numbers. This string is now the way they login to the app. (They have no password or username)

I was told that kids are good at memorizing pictographs way better than what adults thanks to the status of their brain. Amyway it is great approach to make kids have knowledge and importance about tje passcode in terms of management 👏