Husbands and wives are more likely to have baby boys than girls

Oh, boy!

There is no way to ensure that you will be pregnant with a baby boy-not implanted male embryos created through the fertilization of the body-but this does not prevent many couples from trying any (and everything!) Make your dreams come true.

Some people have almost ovulation time, while others have deep penetration. Some women have added potassium intake, while others consume a lot of calories.

British mathematician, Hannah Fry, suggested to take out your calendar and find history.

On Instagram this week, she pointed out that historical data shows that after the First World War and World War II, the number of boys born in England and Wales significantly increased, which was observed in other countries.

This phenomenon is called “returned soldiers effect” -several theories try to explain it.

One is that healthier male soldiers are more likely to survive and return to their wives’ homes in the war-healthier people are more likely to produce male offspring. This is the basis of controversial Trivers-Willard assumptions, which shows different results in different species and research.

Another reason to increase the baby boy is that nature is making up for men in the battle to ensure that men with sufficient population can reproduce.

In the end, one idea was that the soldiers immediately engaged in sexual activities immediately after returning home, causing women to pregnancy early in the cycle.

Flei said: “In fact, a woman imagined that the opportunity of a male or daughter will actually change according to when her cycle is conceived.” “It’s too early, it is more likely to have a baby boy.”

Unfortunately, for couples who want to be pregnant boys, Fry lamented that these odds were “too small”. For a couple, they could “play” them.

“However, when you expand to the size of the population, this is a very clear model. At the end of the war, everyone’s sexual behavior is much more sexually more sexually than usual.” Flei said. “Women are pregnant earlier during the cycle. As a result, the number of baby boys born is a peak.”

It turns out that studying the “returning soldiers effect” has been proven difficult, because it is difficult to isolate the biology and other factors of soldiers (such as the health and environmental conditions of mothers).

At the same time, in the United States, the birth rate of boys is always higher than the birth rate of girls.

For example, in 2022, 1.048 men were born in each woman. No intervention is required.