Why do humans have such difficulty in childbirth while the rest of the animal kingdom, not so much.
That has to do with the large brains humans have.
Babies come out totally helpless and remain that way for several years, and its still a very tight squeeze.
That's the trade-off for the large brains: the extended infancy permitted by our culture allows helpless infants to survive.
Prey animals have to be up and on their feet within a very short time. Young horses can get around pretty well within hours.
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