32 weeks, why do you have to do four?

32 weeks why do four-dimensional? 32 weeks of pregnancy generally do not do four-dimensional color ultrasound, because the baby is relatively large, easy to show the position of the occlusion. 32 weeks of pregnancy is about to do three-dimensional. Late pregnancy ultrasound system, that is, the third trimester of pregnancy row abnormal examination. Because this stage to check the baby has no heart malformation. Five or six months pregnant do four-dimensional color Doppler ultrasound, then the baby's heart structure is still very small, small abnormalities may not be clear to about 32 weeks of pregnancy and then re-check the baby's heart structure. Because as the baby grows up, the structure of the internal organs will be more clear, so it is recommended to be pregnant 28 to 32 weeks or so to do a baby's row abnormal examination.