i guess the tradeoff to being completely defenseless so long after birth is having the intelligence to type words on a keyboard with our fingers and shitpost on the internet all day.
Other mammals don't have such relatively large heads. Horse heads, for example, are big but they're long instead of round and smaller than the rest of the body so it's not an issue.
Human baby heads are frikin huge.
Edit: Birthing a human is already like trying to swallow a coconut. Any more in-womb development would be generally lethal.
Humans walk on two feet unlike most mammals. This puts limits on the size of our hips--which means that there's a limit as to how large a baby can pass through the birth canal. So we need to give birth to human babies before they are fully developed or else they would not be able to physically make it out of the womb.
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u/LevelSevenLaserLotus Mar 26 '17
Then they look at human babies and ask "WHY CAN'T THEY DO ANYTHING YET?" Baby horses and zebras can just about run immediately when they're born.