Study challenges human childbirth uniqueness, finds tighter fits in other primates

High infant mortality documented in some species: Saimiri sciureus experiences neonatal and infant death rates exceeding 34%; obstructed labor and stillbirth cases recorded across multiple primate species.

For over eighty years, a single foundational diagram convinced science that human childbirth was uniquely perilous — a biological tax paid for walking upright and thinking deeply. A new study of twenty-nine primate species, published in Nature, dismantles that assumption by revealing that flawed measurement techniques had obscured equally or more extreme birth constraints in species as small as the bushbaby and squirrel monkey. What emerges is not a story of human exceptionalism, but of evolution arriving at the same difficult problem — large babies, narrow passages — and solving it through ma

Study challenges human childbirth uniqueness, finds tighter fits in other primates

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