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This clip is taken from National Geographic’s Animals in the Womb, a series about looking at babies of all types before they are born. This particular section shows human kiddos — twins, triplets, and quadruplets. They’re calling it 4-D because it’s in real time.

Found while wandering in an entry on womb animals in wtf nature on livejournal. That community may not be safe for work. Take care when clicking links to pictures.