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Researchers Have Determined That Giving Birth ~2 Mya Seemed Relatively Easier Compared To Today. They Ascertained This By Studying Female Pelvis And Baby Head Size Of Ancient Members Of The Human Family Tree. However, Resolving The Time Of Childbirth Evolution Seems Complicated Because Of Unique Obstetric Challenges Of Each Study Fossil.

https://www.dailymail.co.uk/sciencetech/article-7481273/Some-ancient-human-relatives-relatively-easy-time-giving-birth-compared-women-today.html

To find out what childbirth might have been like for our ancient relatives, anthropologists led from Boston University created a 3D model of a female Australopithecus sediba’s pelvis.