For modern humans, vaginal childbirth requires a lot of force, as a large-headed baby is forced through a relatively narrow pelvis. One region that is prone to damage is the pelvic floor, a sheet of muscles that links the left and right halves of the pelvis. Many women tear their pelvic floor during labour, and it’s been estimated that 1 in 4 women experience pelvic floor disorders such as incontinence or organ prolapse.