The price of 4D ultrasound is 400-500 yuan, and the charges are not quite the same for different regions and different levels of hospitals. 4D ultrasound is a kind of ultrasound, which is the most advanced color ultrasound equipment. In addition to general ultrasound functions, 4D ultrasound can also clearly perform three-dimensional imaging of the fetal head and face, which can clearly display the eyes, mouth and nose, and also check the fetal body surface, such as cleft lip and palate, spina bifida, heart and bone dysplasia, to achieve early detection and early treatment. The best time to do 4D ultrasound is during 20-28 weeks of pregnancy, because the fetus’ limbs and major organs have basically developed completely during this period, and there is more amniotic fluid, which is suitable for screening fetal malformations.