I try to avoid the high chairs as they are weirdly programmed. I never understood why a parent and toddler must first sit down elsewhere for the parent to ask the toddler if food would be ok. They might waste an hour finding a seat, and then the parent will carry the toddler to the high chair, but other actions might disturb and I might cancel. It seems like even if I cancel, there ae some hidden actions queued, so the parent will get back to the task eventually. I wish I could see those planned tasks all along!!! The game has a few "chain programmed" actions that makes it impossible for the simmer to know that what you directed them to do is actually going to happen later. Tell them to "feed toddler" and the queued action will say "talk to toddler", which was not what you told them to do, so you might easily cancel and tell them again to "feed toddler". Utterly confusing...
I rather leave a group serving on a counter, and the toddler can help him/herself. I only use high chairs for storytelling or if I decided to waste a simday on confusions, LOL.