Every animal has its own strategies. Many pray herd animals are born walking and basically have to immediately stay with the herd or else they’re left to get eaten. Predators can typically afford to have useless babies because they can protect them until they’re ready to fend for themselves. Humans are among the riskiest births because we have large heads for large brains, and we also adapted to walk upright with a very efficient gait. Both infant and maternal mortality must have been significant in the absence of medicine.
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