Baby Villagers should do a behavior called "studying", where they approach the adult Villagers while they are working on their job site block trying to learn something from them. They will approach different Villagers with different Villager jobs every day. Also, adult Villagers will try to explain what they know to them.
A Baby Villager that's going to be a nitwit will not study at all. They will simply stray off trying to play with iron golems and try to distract other baby Villagers (it will never work, but you know what the annoying kid in class does every day).
When it's not a Villager working time, they will play with each other or sleep when it's nighttime.
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