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NancyLebovitz comments on When does heritable low fitness need to be explained? - Less Wrong Discussion
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That seems orthogonal to NancyLebovitz's point: some women have lower risk than other women when birthing infants with a given head size.
Also, if a woman dies in childbirth, or even if she's injured enough to not lactate well in the days immediately following birth, that strongly impacts the baby. Evolution may not care about how painful birth is, or even how long it takes (now that we don't need to fear predators), but it certainly cares about risk of injury or death to the mother.
Exactly.
Thanks. I was just going to make that point.
Pelvic structure is in play as well as head size.
Also note that there's more to raising children than lactating. Women typically needed to be in good enough shape to do hunting/gathering/food growing.
See Sarah Hrdy's Mother Nature for a reminder that motherhood takes place in the world, not just between the mother and child.