This happens in every game file I've ever played. If I try to have a sim in the household interact with the toddler, the toddler immediately crawls to the top of the stairs and the adult sim will go down the stairs. Then, both are frozen. I've been able to reset the toddler to "unfreeze" both of them, but given that you have to interact with the toddlers a lot (potty training, teaching to walk, etc.), it's really a headache. Does this happen to anybody else? Is there a fix?
Thanks!