Near-weightlessness “causes [sperm] to flip around, to go upside down.… They don’t really know which way is up or down,” Nicole McPherson, a study co-author and a biologist at Adelaide University in Australia, tells the Guardian’s Tory Shepherd. The cells do “not really understand or know which direction they’re going in.”
I would worry also about proper bone and muscle development in utero. I think even under lunar gravity this should concern us. I remember reading in my youth about chickens raised in centrifuges having larger and more developed hearts and legs. I would worry about the opposite problem with babies carried and born in below 1 G environments.
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