What do you think of the periodic table for boys and girls during pregnancy?

The pregnancy cycle table is commonly known as the old yellow calendar by the older generation. It is said that boys and girls can be born according to the pregnancy cycle table. According to the old yellow calendar, we can find out the imaginary age and pregnancy month of pregnant women to determine whether the baby is a boy or a girl. The pregnancy cycle table is a special tool to calculate the birth of boys and girls. This table is for reference only. What about boys and girls in the pregnancy cycle?

According to legend, this table for giving birth to children in Qing Dynasty was invented by a scientist in ancient China. It is based on the deduction of yin and yang, five elements and eight diagrams, plus the calculation of time. At the same time, he painted a portrait of a boy and a girl and buried it under a 700-year-old imperial tomb. The authenticity of the appearance of boys and girls born in the Qing Palace is hard to study, but the painting method of boys and girls is clear at a glance. According to the lunar calendar algorithm, it is clearly listed that 18 to 45-year-old women will get pregnant in different months and give birth to boys or girls. Women can only control the birth of boys or girls by planning to get pregnant every month.

Young couples use this prediction table to predict the birth of boys and girls, just for entertainment. If you want to know scientifically in advance whether it is a boy or a girl, the feasible method is to do B-ultrasound or amniocentesis and umbilical cord blood examination. Predicting the sex of the fetus is to prevent the occurrence of sex-linked genetic diseases, and we have children for prenatal and postnatal care. Boys and girls are the same. The key is that children are healthy and smart.

If someone thinks it's accurate to have boys and girls, it's just a coincidence. Because human sex is determined by genes, and genes are determined by XY chromosomes in germ cells. Because half of the sperm have (22+X) chromosomes, while the other half contains Y gene. X and Y in the sex chromosome are the sex-determining chromosomes. When sperm and egg cells combine, the sex has been determined. If a male sperm containing Y chromosome is combined with an egg cell, development will give birth to a boy. Even, including any method that naturally increases the chances of having boys and girls, it is not absolute. Some people are born with fewer X sperm than Y sperm, and all the children at home are girls. Therefore, the birth of boys and girls cannot be predicted by tables.