Pregnant mothers have to undergo a lot of tests during pregnancy, and one of the very important tests is the ultrasound macroanalysis, which simply means screening the fetus for any significant malformations. Many pregnant mothers will be nervous when it comes to the ultrasound, in fact, as long as you understand the content of this article, pregnant mothers will find that the ultrasound is not as scary as imagined. Ultrasound can see what Ultrasound is to understand the development of fetal baby tissues and organs through ultrasound, mainly to exclude congenital heart disease, hare lip, polydactyly, spina bifida, anencephaly and other major malformations. It is usually done at 20~24 weeks of pregnancy because at this time, the fetus has more space to move around in the uterus and the images are more clearly visualized. If you do it early, the structure is not fully developed and you can’t see it; if you do it late, the fetus has grown up and some of the structure development has missed the best observation period. The results of 2D ultrasound, 3D ultrasound and 4D ultrasound are all the same, and it is not necessary to use 4D ultrasound for the big screening, because 3D ultrasound and 2D ultrasound can also check it out. Four-dimensional color ultrasound is to be able to see the baby’s three-dimensional image, some parents-to-be will treasure the four-dimensional image as the baby’s first photo. Generally, public hospitals use 2D or 3D, while private hospitals use 4D more often, mainly depending on the choice of the parents-to-be. Do ultrasound to wake up the fetus baby Ultrasound major examination is a comprehensive examination of the fetal baby’s head, face, torso, bones, etc., so it is necessary that the fetal baby should preferably be in an active state, so that it can be easy to check, but sometimes the fetal baby is not cooperative, either lying on the ground and not moving, or constantly eating the thumb, can not see the lips … …Many pregnant mothers need to repeat the ultrasound because of the baby’s uncooperative behavior. Generally when the fetal baby is asleep pregnant mothers had better move a little, tap the stomach to wake up the baby, or do some safe small movement, really can not also eat something to wake up the fetal baby. Ultrasound is not everything The ultrasound can only screen for major structural defects, but sometimes pregnant mothers do ultrasound because the fetal baby’s limbs are blocked, can not see clearly, coupled with the fetal position, amniotic fluid, the impact of the machine and other factors, these deformities of the blocked parts may not be found, and even if these factors are excluded, there are still some deformities that ultrasound can not detect, such as Neonatal deafness, cataracts, malformations of the outer ear, etc. cannot be detected.