Abstract …adaptation to bipedal locomotion decreased the size of the bony birth‐canal at the same time that the exigencies of tool use selected for larger brains. This obstetrical dilemma was solved by delivery of the fetus at a much earlier stage of development. (Washburn 1 ) …there can be no doubt that many of the obstetrical problems of Mrs. H. Sapiens are due to the combination of a narrower pelvis and a bigger head in the species. ( Krogman 2 )
No takes yet. Share an insight, caveat, or question.
Rosenberg et al. (1995) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: