Did you try resetting the lot? That might fix issues you're having with it. I think using MoveObjects to move anything the sims might need to interact with can cause problems.
Seeing that issue with the floating baby, if it were me I'd go into build mode and have a look at the levels using ConstrainFloorElevation cheat. Just to see if something wonky is going on there. Resetting the lot won't fix that problem if it's the levels issue as you often need to manipulate the levels to get special things happening with builds. If the levels are wonky you might need to use the terrain leveling tool to fix them.