Which Toddler traits don't break the game?

Have you repaired your game recently? Give that a try if you haven't. And do you have any mods installed that might be out of date? If you do and repairing the game doesn't fix this then try removing your mods folder to see if it's still happening.

My most recent set of toddler twins were both Wild and Clingy and neither of them have experienced the traits glitching into their childhood or their teenhood.