For example, whenever Seneca is playing, I just gopro him playing. And I imported the video files into my Apple photos library. Then later, he can review and replay the videos of him playing, seen on the iPad or iPhone.
My number one tip for new parents is via negativa; no YouTube. YouTube is the devil. 100% no YouTube for your kids.
Uninstall YouTube from your phone, and just let your kids play with GarageBand on your iPhone or iPad instead.