primary data
B-ultrasound will show data such as biparietal diameter, abdominal circumference, femur length, fetal sac and fetal heart rate, which are the key clues to judge the sex of the fetus.
Detail observation
In addition to the basic data, we can also observe placenta, amniotic fluid, umbilical cord and fetal spine from B-ultrasound images, and these details can also provide reference for us to judge the sex of the fetus.
Folk method
People can try some interesting methods. For example, observing the size and shape of the gestational sac, it is generally a female baby whose gestational sac is oval or round, and it is likely to be a male baby.
Biparietal diameter and femoral length
The biparietal diameter represents the transverse diameter of the fetal head, and the femur length is the length of the femur. There is a saying in the older generation: a boy with a short head and thighs, that is, a bicapital diameter-femur length >; 2, a girl who is not much different from her head and legs.
Waiting to be revealed
These methods are for reference only and cannot be 100% accurate. The most accurate thing is to reveal the answer after the baby is born!