Baby's Sex May be Determined by Mother's Breast Size

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When a woman is pregnant, one of the most speculated topics is whether it is a girl or a boy.

Though the only way to tell is to get an ultrasound after a few months or to wait until the baby is born, some people believe there are other ways of predicting the sex of a baby.

A common myth is that the higher the baby bump is, the more likely it will be a boy.

But it turns out, the size of a woman’s breasts might indicate the sex of the baby.

In a new book called Do Chocolate Lovers Have Sweeter Babies?, journalist Jena Pincott utilizes medical research to answer many of the biggest pregnancy mysteries, including the baby’s gender.

Women with larger breast during pregnancy tend to carry girls. Those carrying girls see, on average, an 8 cm increase in breast size, compared to those carrying boys who grow an average of 6.3 cm.

Since the male fetus produces more testosterone, it requires more energy from the mother and these conditions might suppress breast growth.

In the same book, Pincott explains that morning sickness may be a good thing, as it prevents women from consuming potentially toxic food.

Called the embryonic protection theory, it explains why 75 percent of women get nausea and vomiting in the first trimester.

Women who live in a society that eats a lot of corn, one of the least toxic foods, report less morning sickness. While those living in Japan, a country favoring seafood, report the highest rates of morning sickness.

And perhaps the most interesting revelation in her book is that men with brothers tend to have sons, while men with sisters tend to have daughters.

Corry Gellatly, a research scientists, determined that one in five men have a sex-selecting bias in their genes.