Four-dimensional color Doppler ultrasound can really distinguish between men and women through the reproductive organs of men and women, but because of the law, doctors can't disclose the sex of the fetus to pregnant women. Therefore, during the examination, in order to avoid exposing the sex of the fetus, the doctor will take the initiative to avoid the sex characteristics of the fetus and the lower body. At the same time, when the CD is produced later, the part that may expose the sex of the fetus will be processed.

Many pregnant mothers want to judge men and women according to the data on the B-ultrasound list. The value of the biparietal diameter (the transverse diameter of the baby's head) minus the femoral length (the length of the fetal thigh bone) is more than 2, which is a male treasure, and less than 2 is a female treasure. Simply put, boys have short heads and thighs, while girls have small heads and legs.

This statement is also unfounded, because parents' inheritance and fetal development are different, and these data of each baby are different, which has nothing to do with men and women. But because the baby is not male or female, there is always a 50% correct rate, so everyone will have a good time. Just have fun, don't take it seriously.