Boys, girls are equal in number at conception: study

March 31, 2015 7:07 AM

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Boys and girls are equal in number at conception, but more female fetuses die during pregnancy, leading to a slightly higher number of males being born, researchers said Monday.

The study in the Proceedings of the National Academy of Sciences is based on the largest dataset ever analyzed in the search to explain what is known as the human sex ratio, which has been poorly understood until now.

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