I'm not sure really, usually haven't seen the kids "born", just nursing. However, a number of times I've turned on the game after leaving mothers nursing twins or triplets and looked at the kids thinking "where are my twins?" so maybe they can look different or be different sexes. I just haven't pinned it down yet.
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My VV2 story, "A Twist of Fate"
And don't miss Krystal's stories, all three of them!
"Life is too fast... unless you're in traffic."