The mother's hygiene, bladder and hunger bars were all very low and the toddler, on top of being sleepy, also had a dirty diaper. But I really can't tell the same about the mother and the toddler. Now, the kids are OK, since they took care of themselves autonomously. But, since it took so long, I did not even notice the time until I've got the message that it's hour left for her to go to work and the three children in the house to go to school. So, I did that and voila, the little tyke ate as he was supposed to. I've spent a lot of Sim-hours to try to figure this out, until I remembered a similar bug a few days ago with YA Sim. I gave him different food, but that did not work either.
The animations showed he eats, but his hungry need bar did not progress at all. She placed him to the high chair and then went to fridge to gave him some leftovers. During the night, my toddler woke up, because he was hungry, so, I woke his mother to feed him, but that didn't go very well. I just had the worst possible morning in Sims game.