Scientists from Harvard University have made an impressive discovery that rejects the 50% -50% theory of the baby’s sex, identifying a “significant endometrial correlation on the offspring of the offspring”.

According to their study, published in Science Advances, some women are much more likely to have children only one sex.

In addition, they found that the age Mother plays a decisive role in determining baby sex.

Indicatively, women who were younger than 23 years of age when they became mothers were only 34% likely to have children only one sex.

Women who were older than 28 years of age when they gave birth for the first time had a 43% chance of having children only one sex.

Analogously, as age grows older and the likelihood of a woman only giving birth to girls or only boys.

The investigation

According to the Daily Mail, scientists analyzed data from 58,000 women in the US, who had at least two children, examining 8 characteristics: height, body mass index, breed, hair color, blood group, time (natural tendency to sleep at a certain time), age.

Seven of these characteristics did not affect the baby’s sex.

However the study revealed a Basic connection between age in which the mother acquired her first child and if she acquired boys or girls.

The theory 50%-50%

The sex of a baby is determined by the combination of racial chromosomes inherited by sperm and egg.

While the egg always carries an X chromosome, the sperm can carry either an X or a Y chromosome.

If the sperm carrying a chromosome x fertilizes the egg, the fetus will be feminine, while the fetus will be male if it is Y chromosome.

This has long been seen as a 50/50 division.

This theory is now overthrown as the mother’s age comes into the equation.

Although the ratio of the connection remains unclear, researchers say it could be related to Normal changes that women are undergoing as they grow older – including a smaller follicular phase and a lower pH of the vagina.

“A smaller follicular phase tends to favor the survival of the Y chromosome, while a more acidic vaginal environment favors the survival of X chromosome,” the group explained.