Have all girls or all boys? Study suggests the odds aren't 50/50

July 22, 2025
Newborn babies lie in bassinets in the nursery of a postpartum recovery center in upstate New York in 2017. A new study examined births over decades to find tendencies toward having all girls or all boys.

A study analyzed decades of births and found that larger families showed a distinct tendency toward all girls or all boys, rather than a mix.

(Image credit: Seth Wenig)



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