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skeptical_lurker comments on When does heritable low fitness need to be explained? - Less Wrong Discussion
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I'm not sure what you've got in mind there, but it would be worth looking at whether there are some tradeoffs between being able to give birth easily and how good a woman is at walking and/or running.
While in hunter gatherer times it would have been important to run fast, as civilisation arises you get chased by bears less often, and so I could guess that hips would start to become wider.
The hips already became a lot wider X-/ along with other body parts.
And given contemporary medicine, a narrow pelvis isn't really a big deal nowadays.