Pregnant women do big row deformation and four-dimensional same?

Pregnant women do big row abnormal and four-dimensional same? Pregnant women do big row abnormal is four-dimensional color ultrasound, four-dimensional color ultrasound is called pregnant women big row abnormal. General pregnant women do big row abnormal, it is recommended to be pregnant 20 weeks to 26 weeks or so to do, because this stage, the baby is not small, and there is amniotic fluid, baby activity space is large, so do four-dimensional color ultrasound big row abnormal is easier to see whether the baby is deformed, the baby is not easy to cover themselves, in case of shielding, baby fetal movement, it can also be seen again. The larger the month, the more difficult it is to check the baby's deformity, because the baby's space range of activities is very small, they will cover themselves. Four-dimensional color Doppler ultrasound is a large row of abnormalities.