Sims 3 Newborn baby glitch!?!?

please help my sims 3 newborn babies have become these sometimes invisible and other times Stick like! i have read that it has to do with a mod but i have never downloaded a mod. i have some custom content but i have had no problems until today.
Update: http://i44.tinypic.com/j0i8vd.jpg

this is what the baby looks like.
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