Holly Dunsworth, chief antagonist of the tidy but ill-supported "obstetric dilemma" hypothesis, nicely summarizes its problems. The hypothesis has implications for the evolution of bipedalism and human endurance.
http://www.sapiens.org/blog/origins/labor-pains-helpless-infants-eve-evolution-part-one/
Spoiler: part two will outline Dunsworth's metabolic hypothesis. Good stuff- my motto is "it's all about energy, stupid!"
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