Difficult Birth


Too large a head
2.5 million – 200,000 years ago

For humans, childbirth is difficult and dangerous. Unlike other primates, mothers almost always need help. This is because walking on two legs means a narrow pelvic canal for the baby to pass through, while our heads have grown. To compensate for harder births, human babies are born small and more helpless.

See other: What Makes Humans Human?

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2 thoughts on “Difficult Birth

  1. It helps, of course, that young human bones are like rubber and quite pliable, allowing a baby’s head to be squeezed, like toothpaste, to fit the size of the tube.

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