Ideas
Most of the time, at least for me, when I can't get a parent to finish an action with an infant it's because the infant immediately calls another adult to take it out of the high chair, crib or whatever. They usually have "sleeping next to......" or play with ...... in their q. Trying to cancel whoever they summoned only works if that sim is fairly far away. Otherwise, I have to constantly reset. I've looked this up numerous times and the internet seems to believe there's no way to stop it. If they're just tired, I leave them on the floor and lock the door so the infant is forced to pass out on the floor. If it's hungry I make a sim use a bottle or breastfeed as the infant won't stay in the highchair. Then let it pass out on the floor with the door locked. Any other need can be dealt with later. My save is modded to try and stop this and the check infant/toddler and for mccc. I did recently start an un-modded save to see if this frustration is just as bad in an unmodded game. I don't have a ton of time to play games though, so unfortunately I didn't stick with it. It seems that needs to change, lol. I'll need to go back to it as I'd love to upload saves to help ea solve these kinds of problems. And to know for myself if the issue is an old save that's getting bloated, the mods, or truly bugs.