Infant & toddler vampire bug

So I imported a vampire sim from my gallery that I made and aged her down to an infant and then toddler and for some reason it's giving her a dark form in those life stages and not using the infant and toddler sim I made plus for some reason they don't have legs? I've tried saving and re opening my game and deleting the sim and re putting her in but each time I finish making her as a toddler or infant I load in and it gives her a randomized dark form and doesn't load in her legs