Learn how 3D models of primate birth canals found that squirrel monkeys, bushbabies, and other small species may face a tighter squeeze than humans. A diagram drawn by a primatologist in the 1940s has ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. New research finds some small primates face birth canal constraints as severe as, or greater than, those seen in humans. (CREDIT: ...

According to a new study, chimpanzees, like humans, must contend with a confined bony birth canal when giving birth. In humans, the problem was exacerbated by our unique form of upright walking since ...

As billions of people can attest, giving birth is hard for humans. Our infants have an exceptionally large head for their body size and yet have to squeeze through a very narrow pelvis. Appendages can ...

Scientists have long thought humans have a uniquely difficult birth compared with other primates. And it's true that, from an evolutionary perspective, we face an obstetrical dilemma. As we evolved to ...

Human birth is far more challenging than that of other primates. In 1960, anthropologist Sherwood Washburn proposed a widely accepted explanation for the tight squeeze a baby experiences passing ...

Medical intervention in human birth has become so widespread that spontaneous delivery is an increasingly rare event. Yet convincing evidence reveals an underlying 24-hour biorhythm, reflecting a ...

The broader message is unsettling and clarifying at once. Human childbirth is risky, but it may not be uniquely risky. Instead, the research suggests that difficult birth is part of a wider mammalian ...

For decades, one idea has shaped discussions about human evolution and birth: humans endure unusually difficult childbirth because large-brained babies must pass through a relatively narrow pelvis ...

Add Yahoo as a preferred source to see more of our stories on Google. Human childbirth may not be unique, a new review finds similar birth risks across many mammals. (CREDIT: Shutterstock) Human birth ...