So, what is it? 1. Slim women Italian scientists have made a statistical comparative analysis of the fertility status of 1 10,000 women and found that there is a very interesting relationship between women's weight and the sex of their children: the possibility of giving birth to a girl is about 10% higher for women who weigh less than 54 kg before pregnancy than for women who exceed this weight index. It is concluded that slim women are more likely to have girls than plump women, and American scientists have reached a similar conclusion through research. 2. Vegetarian and sweet women British scientists have found that pregnant women who are vegetarian are more likely to have daughters. According to the research, the ratio of boys to girls in Britain is 106 to 100, but the ratio of sons to daughters born by vegetarian women is 85 to 100. This data shows that pregnant women who are vegetarian are more likely to have daughters. Researchers in the United States have found that food can swing the female reproductive system pipeline through hormone action, and the content of sugar and fat in women's diet has a certain influence on the sex of the fetus. Women who love sweets are more likely to have girls. 3. It is an indisputable fact that the older the husband and wife are, the greater the chance of having a daughter. Because age will affect the physical quality of both men and women, the sperm count of men will decrease with the increase of age, and the older women are, the changes of physiological hormones will also reduce the alkaline secretion in the uterus year by year, and the chances of giving birth to girls will also be greatly improved. 4. The latest research by Danish psychologists shows that after women are under strong mental stress, most pregnancies are girls. If women are too nervous and stressed, they will have a strong acidic environment, which is not conducive to the survival of Y sperm and improves the chances of giving birth to girls. Long-term stress on men will also reduce the number of sperm. Although it is easy to have a baby girl in a stressful environment, it is not recommended that women get pregnant with pressure. The health of mothers and babies is more important than having boys and girls. Everything should be natural. 5. Women with acidic constitution want to have a girl. Women should avoid eating too much alkaline food, eat acidic food properly, and of course, don't eat too much acidic food, so as not to affect their health. Both men and women should pay attention to a balanced diet. Daily acidic foods include: all meat, fish, dairy products except fresh milk (such as cream, ice cream, cheese and flavored milk), rice and wheat flour products, canned food, corn, protein, sour fruit, chocolate, drinks and vinegar. 6. Women who smoke If their parents are smokers and smoke during pregnancy, their chances of having a boy will drop by nearly half. Smoking by parents may "strangle" the male fetus in the womb. Even if only the father smokes, those passive smokers who live in a smoking environment will have more girls.