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There will never be anyone around able to empathize enough to understand what's bothering them. Why bother crying?

Why don't kittens, baby rabbits or calves cry that loud that much? Instead they happily crawl around. What makes human babies so problematic and miserable?

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Compared to most other animals, human babies are born more helpless and dependent on those around them (for example, most other species have young that are able to crawl or walk already).

I believe the theory I've heard goes something like: It was beneficial for humans to start walking upright, but that development puts selective pressure on having a narrower pelvis for increased stability. Having a narrower pelvis implies having a smaller birth canal, which in turn puts pressure on having a shorter gestation period.

I wonder if we can fix it after introducing uterine replicators.

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