Women who have early menarche are more likely to give birth to a girl
in Hyogo Prefecture, Japan healthy Institute researcher Fukuda and his colleagues examined information on more than 10,000 mothers, including their age at menarche and the gender of their children.
It was found that those who start menstruating at the age of 12 female , the proportion of giving birth to a girl is 53%. If menstruation occurs at the age of 14, this number drops to 50%.
Fukuda said that if a woman gets her period before age 12, her estrogen levels are higher, which can lead to male The embryo spontaneously aborts.
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