I have the same problem as well. I happen to have my 3 children grow up in the same day (1 goes to teen, and the other 2 go to toddler) Everything works fine until I exit the game WITHOUT SAVING. Then, I play this family again and find out that all of their body and their age are stuck in their previous stage, but they all have their upper part of the body of their older stage (1 have teen's head with kid's body, the other 2 have toddler's head with baby's body). The teen with kid's body can finally be fixed because I can manually age him up himself to be teen again. Sadly, for the toddler, they cannot age themselves without someone carrying them and the game doesn't allow other sims to carry them (I don't know why) and so it stucks with the error message like you
I play so many hours with this family and now it's unplayable. I'm so upset with you EA. So much glitches with this game.
