10 Cesarean Sections Make Women’s Hips Narrower Cesarean sections are leaving women with smaller pelvises. Centuries ago, women with small pelvises died during childbirth along with their children, who could possess the genes for small pelvises. However, these women are surviving these days as C-sections become mainstream. They are also able to birth children with the genes and even female children with narrow pelvises, who also pass the trait to their offspring . Studies have shown that 36 of every 1,000 children born today have a narrow pelvis. In the 1960s, it was just 30 of every 1,000. [1] At this point, some would start to wonder why natural selection did not leave all women with large pelvises. That is because the human body evolved to prefer smaller babies that could pass through the narrower pelvises instead of larger babies that could pass through wider pelvises. Interestingly, C-sections are slowly changing this. Babies are becoming larger despite their ...