Human babies pack a lot of growth into those nine months between conception and birth to give them and their meaty, complex brains a chance at survival.
Just how evolution came to grant humans such a comparatively rapid prenatal growth rate has never been clear.
Given how critical brain growth is to early human development, and head size, in turn, influences the size of our jaws, researchers suspected teeth may hold some valuable information on our ancestors' pregnancies.but don't develop their hardened exterior layers until the second trimester. From there, the growing layers can retain records of their life history, from weaning to sexual activity.
They found that prenatal growth rate, head size, and relative molar size did indeed all follow the same pattern across all these primates. So they used this established pattern to delve into our evolutionary history, analyzing primate fossils spanning between 6 million to 12,000 thousand years ago, covering 13 hominid species.
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