How many months does the double peak diameter look like for men and women?

During pregnancy, pregnant women need to undergo various pregnancy tests at different times, mainly to judge the development of the fetus through data. In pregnancy tests, the biparietal diameter is a very important data, and it can also estimate the weight of the fetus. However, some people use the biparietal diameter to judge the gender of the fetus. So, how many months can the biparietal diameter be used to judge the gender? Let's take a look.

First of all, if the parents are tall and strong, then regardless of whether they are pregnant with a boy or a girl, the double-thigh maternal size will basically be greater than 2.1 in the late pregnancy (after 30 weeks). It is not ruled out that it will be greater than 2 in the early stage. For this type of parents, it is difficult to use this method to determine the gender of the baby.

On the contrary, if the parents are neither tall nor big, at the 24th week of pregnancy, the biparietal diameter minus the femur length = 1.7 or more. After that, the biparietal diameter minus the femur length will gradually increase in each B-ultrasound. For example, at 24 weeks: the difference is 1.7, at 28 weeks the difference is 2, and after 30 weeks it is more than 2.1, then the baby born to this type of mother is likely to be a boy. The chance increases by 80%.

Secondly, the baby's head is larger than the actual gestational age by at least one week during the prenatal check-up. Here, "large" must be larger than the actual gestational age. For example, if the head is 30 weeks old, the BC shows a value of 31-32 weeks. It is not called a big head if the biparietal diameter-femur length is greater than 2. For some babies, the head meets the gestational age, but the legs cannot keep up with the gestational age, then the biparietal diameter-femur length must be greater than 2 or even more. In this case, it is not called a big head, but only short legs. This is why some mothers are inaccurate.

Factors affecting biparietal diameter and femoral length in gender

Although we already know the principle of giving birth to boys and girls, there is still one situation that is always puzzling, that is, some people always give birth to boys, while others always give birth to girls. Although it is not possible to control the gender as people wish, scientists have found that gender is related to the following factors:

1. Genetic influence: There is often a family tendency to have a boy or a girl.

2. The influence of acid and alkaline environment. Y sperm is resistant to alkaline but not acid. Y sperm is active and easy to combine in alkaline environment, while X sperm is active in acidic environment and easy to fertilize.

3. The influence of sexual life. If the woman reaches orgasm and is fertilized, it is easy to have a boy. This is because the secretions of the woman during orgasm contain alkaline. On the contrary, if the woman ejaculates too early during sexual life, it can increase the chance of having a girl.

4. The influence of metal elements. Eating salty and potassium- and sodium-rich foods in the first 6 weeks of pregnancy can increase the chances of having a boy.

5. The influence of seasons. Pregnancy in spring and autumn is more likely to result in the birth of boys, while pregnancy in summer and winter is more likely to result in the birth of girls.

6. The influence of age. For every 5 years the couple's age increases, the chance of having a girl increases by 1%. If the husband is too old, the chance of having a boy decreases. Men aged between 25 and 29 have more boys than girls, while those aged between 25 and 29 have more girls than boys.