分娩难题：骨盆演化与剖腹产的未来

Some argue we’re evolving to become wholly dependent on C-sections and other serious medical interventions. But a surprising new understanding of the pelvis tells a different story, finds Colin Barras T HE female pelvis may become too narrow for vaginal childbirth, meaning that caesareans could become the only option for delivering babies. At least, that’s the claim made by a research team last year. Their calculations suggest that in Australia, Mexico and Poland, the average female pelvis is now 4.2 centimetres narrower than it was in 1926. If the trend continues, they wrote, surgery may be the only way for our species to continue. …