https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8518115/
Published online 2021 May 19
The obstetrical dilemma hypothesis: there's life in the old dog yet

Abstract
The term ‘obstetrical dilemma’ was coined
by Washburn in 1960 to describe the
trade‐off between selection for a larger
birth canal, permitting successful passage
of a big‐brained human neonate, and the
smaller pelvic dimensions required for
bipedal locomotion.

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