The tight fit of a baby's head through a mother's birth canal, which causes great difficulty in childbirth, is not unique to ...

Human birth has a reputation for danger. The usual explanation is simple enough: walking upright narrowed the pelvis, while evolution also favored babies with large ...

The tight fit of a baby's head through a mother's birth canal, which causes great difficulty in childbirth, is not unique to ...

For centuries, childbirth’s pain was explained as punishment; more recently, as the evolutionary price of walking upright and bearing large-brained babies. But if difficult birth occurs across ...

Human childbirth is commonly viewed as uniquely difficult and dangerous. The reason: The combination of bipedalism and large brains creates a tight fit between the baby and the birth canal. Research ...

Instead, some small-bodied primate babies have heads almost twice as large as their mothers’ pelvic space, a new study led by ...

Human childbirth is risky, but it may not be uniquely risky. Instead, the research suggests that difficult birth is part of a wider mammalian pattern, one rooted in trade-offs that evolution has not ...