Obstructed labor in humans

A mathematical model of human obstetrics finds that weak selection for a large newborn, a narrow female pelvis, or both factors might account for the large number of cases in which newborn size and maternal pelvis dimensions result in obstructed labor; the model suggests that the regular use of Caesarean sections in modern times may have led to an evolutionary increase in the rate of disproportion between fetal and pelvic dimensions by 10-20%. - Read at PNAS.org

Article #16-12410: “Cliff-edge model of obstetric selection in humans,” by Philipp Mitteroecker, Simon Huttegger, Barbara Fischer, and Mihaela Pavlicev.