I'm not a huge fan of the toddler stage. I don't like teaching them to do stuff, I don't like making the parents spend hours of their day trying to get them potty trained, or talking or whatever. And I can't just NOT teach them how to do stuff and let them end up with a bad trait. It's always a relief to me when they age up into children and can do most things for themselves.
I mostly just let my sims do what they want on free will, except for occasionally redirecting them to certain activities, but the toddler phase requires more redirection than I'd like. lol
Toddlers in real life are WAY more fun!