Experienced mothers-in-law and mothers always have a "unique eye", and when they see expectant mothers with large stomachs, they can't help but enthusiastically help infer whether the baby in their stomachs is male or female... Some people say that expectant mothers with sharp stomachs give birth to boys and round stomachs are the key to girls' success. Without the pressure of passing down the lineage, girls nowadays would not be able to appreciate the importance of the secret recipe for giving birth to boys and girls. Regardless of the nagging and nagging of our ancestors about giving birth to a son, the increasing number of husbands clamoring for their daughters is also very annoying. If you really want to know how to have sex to smoothly "get a man for a man, get a woman for a woman", you can check out the German scientific journal
Previous studies have long found a close correlation between the gender, birth time, and environmental temperature of mice and bats. In order to identify the relationship between the gender of human babies and environmental temperature, German researchers tracked birth records from 1946 to 1995 and compared them to local temperature changes. It was found that April to June are the months with the highest number of male births in the local area, while October is the month with the lowest number of male births.
Further analysis shows that the ambient temperature of the month before the zygote is combined, that is, the ambient temperature of the month before the boys and girls have sex, is an important factor affecting the baby's gender. High temperature environments can easily create male babies, while low temperature environments can easily create female babies.
The reason why temperature affects the gender of babies is based on the hypothesis of researchers: high temperature can affect the X chromosome of sperm, making it difficult for female babies to be born; Low temperature can affect the Y chromosome of sperm, making it difficult for male babies to be born.
Another hypothesis is that the higher the temperature, the stronger the desire for sex. High temperature environments can stimulate an increase in the frequency of sexual activity between men and women, making it easier for women to conceive.
Other studies suggest that sperm with the Y chromosome swim faster; But sperm with an X chromosome are relatively strong. So in situations of frequent sexual activity, sperm with the Y chromosome are more likely to combine with the egg and give birth to a male baby. However, in cases of reduced sexual activity, sperm with the X chromosome are more likely to wait for the opportunity to combine with the egg, making it easier to give birth to a female baby.
Researchers are concerned that under the increasing global temperature greenhouse effect, the probability of male babies being born may increase, which may lead to an imbalance in the gender ratio.