How Is This Possible?

I do know that if your sims feed the infant too often, the kid ages up to be heavier than their parents. I hired a nanny once, and only once, because my sims had twins. Well...she was constantly picking them up to feed them, even when they weren't hungry. Both of them were heavy set when they grew up, but their siblings were skinny. I let the babies cry for a little bit, waiting for them to need diaper change and feeding all at the same time. and the kids grow up skinny. But don't wait too long, they might get taken away. lol