About the SA Blog Network

Posts Tagged "bipedalism"


Why Humans Give Birth to Helpless Babies

Newborn baby

Human babies enter the world utterly dependent on caregivers to tend to their every need. Although newborns of other primate species rely on caregivers, too, human infants are especially helpless because their brains are comparatively underdeveloped. Indeed, by one estimation a human fetus would have to undergo a gestation period of 18 to 21 months instead [...]

Keep reading »

More from Scientific American

Email this Article