For boy/girl twins, the girl is less successful in adulthood - Vanguard News Nigeria

Women who shared their mother’s womb with a male twin are less likely to graduate from high school or college, have earned less by their early 30s, and have lower fertility and marriage rates when compared with twins who are both female, according to new research.

“This is the first study to track people for more than 30 years, from birth through schooling and adulthood, to show that being exposed in utero to a male twin influences important outcomes in their twin sister, including school graduation, wages and fertility rates.” The study supports the “twin testosterone-transfer hypothesis,” which posits that females in male-female twin pairs are exposed to more testosterone in utero via the amniotic fluid or through the mother’s bloodstream that they share with their twin brother.

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