The relatively narrow human birth canal presumably evolved as a 'compromise' between its abilities for parturition, support of the inner organs, and upright walking. But not only the size of the birth ...

During human birth, the fetus typically navigates a tight, convoluted birth canal by flexing and rotating its head at various stages. This complex process comes with a high risk of birth complications ...

Scientists are revisiting an influential theory that the evolution of big brains made human childbirth risky. By Carl Zimmer It’s a question on every new parent’s exhausted mind: Why are babies born ...