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While requests aren't allowed, I did move the thread to the modding discussion forums so maybe someone would be able to help you out on it!
Although I have to agree with ShigemiNotoge, I don't think it's possible since TS4 babies are basically objects instead of actual sims, unfortunately... I guess the only way, and I have no idea if that is actually possible, is to let the game randomize the 'baby mesh', which might require having to edit a python script? So whenever a baby gets born, it doesn't just load that one baby mesh we all know, but if possible, another mesh as well