If the head circumference is larger than the waist circumference, it is a boy

After becoming pregnant, pregnant mothers always have various curiosity about the baby in their belly, and the most curious question is whether the baby in the belly is a boy or a girl. Although it doesn't matter whether you have a boy or a girl, as a mother, I always hope to know more about my baby and know every information about him, especially the gender. At present, there are many ways to identify the gender of the fetus on the Internet. One of the more popular methods is to infer based on the comparison of the fetus's head circumference and abdominal circumference. So is it accurate to infer the baby's size based on the abdominal circumference of the first fetus? Here I will explain it to you one by one.

Is the baby's head circumference larger than the fetal abdominal circumference a boy or a girl?

The popular saying is to identify the gender of the fetus in this way: first, if the parents are tall and strong, then regardless of whether they are pregnant with a boy or a girl, the fetal biparietal diameter - fetal femoral length is basically more than 2.1 in the late pregnancy (after 30 weeks), unless it is more than 2 in the early stage. Such parents are not good at distinguishing the gender of the baby by this method.

On the contrary, if mom and dad are not tall, then they are not big. At the beginning of the 24th week of pregnancy, the fetal biparietal diameter minus the femoral length = 1.7 or more. Since then, the fetal biparietal diameter-fetal femoral length has gradually increased with each B-ultrasound. For example, at 24 weeks, the interval is 1.7, at 28 weeks, the interval is 2, and after 30 weeks, the interval is more than 2.1, so the baby born by this type of mother is likely to be a boy.

Although this method is used by many mothers to distinguish between men and women, it is actually unreasonable. There is no direct evidence that the fetal biparietal diameter, head circumference and fetal femur length are professional indicators of the baby's growth and development that can be used as a basis for inferring the sex of the fetus. So when pregnant mothers see this, they can just smile foolishly, and there is no need to be too serious.

The role of fetal biparietal diameter as an indicator of baby's head circumference and fetal abdominal circumference

Fetal biparietal diameter is also known as BPD, the biparietal diameter of the fetal head. It refers to the length of the widest part between the upper and lower sides of the fetal head, also known as the "great transverse diameter of the head." Doctors often use it to observe the growth and development of children, determine whether there is cephalopelvic disproportion, and complete the delivery of pregnant women. At full term, BPD should be 9.3 cm or above. According to general regularity, after the fifth month of pregnancy, it is basically consistent with the pregnancy phase. In other words, the BPD is about 7.0 cm at the 28th week of pregnancy (7th month), about 8.0 cm at the 32nd week of pregnancy (8th month), and so on. After the eighth month of pregnancy, an average increase of about 0.2 cm per week is normal. Fetal abdominal circumference refers to the growth and development of the fetal abdomen. Pregnant mothers can determine whether the fetus is growing and developing normally by checking the size of the fetus's abdominal circumference. If the fetal abdominal circumference is relatively large, it means that the fetus is relatively fat, and if the fetal abdominal circumference is relatively small, it means that the fetus is small.

Therefore, the fetal biparietal diameter, baby's head circumference and fetal abdominal circumference are indicators for judging whether the fetus is growing well during examination. Mothers only need to listen to the saying that the fetal biparietal diameter, baby's head circumference and fetal abdominal circumference are used to infer the fetal gender indicators, which cannot be used as a basis for judgment. Every mother is more or less curious about the baby's gender, but in the final analysis, mothers' only wish is that the baby can be born healthy and happy.