How many times can we do B-ultrasound during pregnancy?

　　Pregnant women can learn more by doing B-ultrasound fetus development, but doing too much B-ultrasound will harm the fetus. Therefore, for the sake of the fetus healthy , don’t do too many B-ultrasounds. Under normal circumstances, four B-ultrasounds are enough during pregnancy.

　　 Do a B-ultrasound around the 7th week of pregnancy . The purpose of this B-ultrasound is to determine whether the pregnancy is extrauterine or intrauterine and whether the embryo is viable. At 7 weeks, the fertilized egg has implanted Uterus The endometrium develops and a heart tube develops. At this time, heart tube pulsation will be seen on ultrasound. If there is no cardiac pulsation temporarily, check again after 1 to 2 weeks. If the fertilized egg implants and develops in parts other than the uterus such as the fallopian tube, ovary, peritoneum, etc., it is Ectopic pregnancy , measures must be taken promptly.

　　Do a B-ultrasound at 20 to 24 weeks of pregnancy , during which limbs and internal organs have developed. If there are deformities at this time, such as malformations of limbs and internal organs, cleft lip ( harelip ), cleft palate, etc., can be seen through ultrasound examination.

　　Do a B-ultrasound at 28 to 32 weeks of pregnancy , understand the fetal development in the womb, some difficult to detect in the early and second trimesters disease , such as hydrocephalus, etc., can be detected through ultrasound examination at this time. 》》》 Suitable for pregnant women5sexual intercourse position

　　Do a B-ultrasound at around 39 weeks of pregnancy . At this time, the pregnancy is nearly full term, and the ultrasound examination mainly checks the maturity of the placenta, amniotic fluid volume, fetal development size, and whether there is Umbilical cord around neck and other situations to provide a basis for production methods. If the fetus is breech, transverse or the placenta is in a low position (i.e. placenta previa ), the risk of natural delivery is too high, and dystocia may even occur. In this case, cesarean section should be chosen.