It has nothing to do with the gender of the fetus, it is a superstition, it needs to be rechecked after appropriate activities. 4D fetal system ultrasound examination, most hospitals require that it be performed at 20-24 weeks, the systematic aberration examination of the fetus requires a high level of fetal position, the fetus is in a good position, it is easier to check, and it can be clearly checked for the development of the various systems. If the fetal position is inappropriate, limb covering or fetal prone position, all affect the examination effect, the fetal position has no relationship with fetal sex, may be related to the presence of uterine developmental abnormalities, gestational weeks, maternal hunger and other factors, you can be appropriate activities or appropriate food, such as sweets or other foods such as chocolate, fetal activity position change before the examination. If the position is related to abnormal uterine development, such as uterine longitudinal septum, it may be more difficult to change, and need to be examined several times to assess the growth and development of the fetus.