I'm playing a family and it was fine yesterday. Loaded the Game as normal, and it said Missing Objects Warning..some items were replaced. Or something like that. Anyway, I noticed the baby was missing. It was left in its crib on my last save. I found it outside the room, under the snow. And it's now invisible. The Dad can hold it, but can't do anything else with it. I don't know what's gone wrong. I've recently installed Showtime and University. But I don't think that is affecting gameplay. Anything I can do about this?

Try resetting the baby, type resetsim firstname lastname into the cheat box.