A literature review and data analysis reveals that difficult childbirth (dystocia) occurs in many wild and domesticated mammal species, and at rates that equal or exceed those in humans. This may result from a natural selection tradeoff between offspring size and dystocia incidence.

Summary: https://scitechdaily.com/scientists-challenge-a-long-held-belief-about-why-human-childbirth-is-so-difficult/

Original paper: https://onlinelibrary.wiley.com/doi/10.1002/brv.70174

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