That is a glitch caused by CC you downloaded... most likely these Custom Contents can be the problem:
1) "Night and Day Boots"
2) "New CAS Project" (it's a picture of a vampire looking girl)
If you find these in your launcher, uninstall them and your problem should be fixed once you have another baby.
Sorry if you don't have either of those Custom Contents, it must be another piece then. Look on Sims3 Forums or something if I didn't help.