What is the constitution of "having a boy"? Why do women always have boys?

With the progress of society, people now advocate equality between men and women, but since the country opened the second child policy, more and more families gradually hope that they can have two children, so that their lives will be "complete". But having boys and girls is a matter of probability, not giving birth to whatever you want. But there will be some people in life who always tend to have children of the same sex. For example, we all know that Cecilia Cheung, a famous Hong Kong movie star, has given birth to three sons in succession, which really makes many people envy him. She thinks that Cecilia Cheung is a legendary "masculine" physique. So does the so-called "male" constitution really exist?

Before the scientific explanation, let's take a look at some old ideas about having boys and girls:

(1) feudal superstition;

In the past, anyone who didn't have a son would be attributed to various unrelated reasons, such as Feng Shui. These are feudal superstitions, which are unconvincing.

(2) Taste cues;

As the saying goes: sour girl. It is the daughter who likes spicy food and the son who likes sour food. This is not reliable either. From a medical point of view, after pregnancy, the placenta will secrete a special substance-human chorionic gonadotropin. It will cause changes in the appetite and taste of pregnant mothers, but it will not determine the problem of having boys and girls.

(3) visual discrimination;

This statement is also very outrageous. People decide to have boys and girls according to the shape of pregnant mothers' bellies. Boys are at the top of their bellies, and girls are circled. In fact, the shape of the pregnant mother's belly is related to the baby's position and the mother's pelvis.

(4) It's all women's fault;

In the eyes of the world, it's nothing for men to have boys and girls, but it's important for women to live up to their expectations. I have to say, from ancient times to the present, how many women have shouldered this heavy yoke!

What is the decision to have boys and girls?

The genetic explanation is that it is up to the man to have boys and girls. Because the woman only provides X sex chromosomes, and the man can provide two sex chromosomes (X or Y). When the male Y chromosome is combined with the female X chromosome, a male baby will be born, and vice versa. Whether it is a boy or a girl, there will be a 50% chance. Therefore, it has nothing to do with the physique of both husband and wife, but is mainly determined by the sperm chromosome of the man, so the sex of the fetus is also relatively random.

Why do some women keep giving birth to boys or girls?

Since the sex of the fetus is achieved randomly through the combination of chromosomes, will the husband and wife affect the results in different environments? For example, there was a saying that X sperm would move better in acidic environment, while Y sperm would move faster in alkaline environment. In fact, as early as the 1970s, there were related studies, and it was found that the motility of X sperm and Y sperm was not so different in both acidic and alkaline environments. Because our human blood itself, is to maintain the PH value between 7.35 and 7.45, showing weak alkalinity. If it deviates too much from this range, the cells of the human body will not be able to complete their physiological functions normally, and acidosis or alkalosis will occur. Therefore, the so-called acid-base constitution does not exist, and it is even more nonsense to have boys and girls. And like some women who always have the same sex in their lives, they can only say that they are lucky.