When do you do four during pregnancy?

Four-dimensional pregnancy is generally between 20~26 weeks can do, because in this period of amniotic fluid volume is relatively sufficient, at the same time the various organs of the fetus has been fully developed, after doing four-dimensional color ultrasound, you can monitor the situation of the fetus. Generally see whether the fetus has abnormalities and whether it shows anencephaly and congenital spina bifida, or cleft lip and palate. Pregnant period can also be in the 30th week, and then do a four-dimensional color ultrasound, mainly to see the fetal heart development, at the same time in pregnancy to do pregnancy check on time, at any time to monitor the situation of pregnant women and children.