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

Learn how 3D models of primate birth canals found that squirrel monkeys, bushbabies, and other small species may face a ...

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 ...