Control the toddler as much as possible to keep them from starting something the parent won't be able to interrupt.
Some of us are having a bug where the parents keep having routing issues trying to take the child to bed. If you find you have that problem, the workaround is to make both the parent and child walk into the bedroom separately (using "go here") and then select the "read to sleep" or the other put to bed option.
High chairs are hard to use. I usually put plates of food out on the counter and direct the toddlers take a serving themselves. I haven't used a high chair in a while but I think I had learned that choosing "get food for" or similar wording on the high chair would result in the parent both putting food out and putting the toddler in the chair. Putting the child in the chair first and then trying to get food would usually result in the toddler asking to be taken out and the parent canceling the get food command to oblige.
I haven't had a problem with baths but my sims do have routing issues bathing dogs in small bathrooms, so maybe make sure there's enough space around the tub?