Best time for four-dimensional inspection

The best time for four-dimensional color Doppler ultrasound examination is between 20 and 24 weeks of pregnancy, because during this time the fetal organs are basically mature, and the space of the uterus is relatively large, which is very suitable for the transformation of fetal position. Do four-dimensional color Doppler examination is mainly to check the growth and development of the fetus and whether there are obvious abnormalities in the fetus, such as anencephaly, spina bifida, congenital heart disease and whether there are limbs missing, etc. Therefore, in the process of doing four-dimensional color Doppler examination of the fetus, the change of fetal position is very important. If the fetus does not move, it is easy to press the relevant limbs, thus leading to the possibility of missed diagnosis. If the baby is not moving, it is best to eat hot foods, such as chocolate, to induce a change in position.