Do pregnant women have to do three or four?

Three-dimensional and four-dimensional are all examinations to be done, and cannot be missed. Three-dimensional B-ultrasound has obvious advantages in the diagnosis of fetal cleft lip and palate, spinal deformity, cardiac malformation, etc. Therefore, the development of the fetus can be detected through three-dimensional detection, so four-dimensional is also a screening of deformity. It is also a clearer screening. Basically, the probability of fetal sudden deformity will be very low after four-dimensional, and some hospitals will also do four-dimensional at 28 weeks. Therefore, these two examinations are very important, it is related to the development of the fetus, so to achieve the purpose of eugenics.