When you are pregnant, it is very essential for the moms-to-be to go for ultrasound checkups on time. Because at each stage of pregnancy, the fetus develops in different parts, so it must be timely and on time when, to review. For example, when you are pregnant, do ultrasound, usually at the beginning or late in the two-dimensional ultrasound, and in the middle of the time, you need to do four-dimensional ultrasound. There is also the Down’s syndrome screening, it is important to do the Down’s screening according to the time, all these are very important. Prenatal ultrasound is a relatively common examination method during pregnancy, which is safe, reliable, non-invasive, repeatable and so on, and the data reflected is the main basis for doctors to analyze the growth and development of the fetus. If the pregnant woman herself can understand the data on the ultrasound list, it will greatly reduce the psychological burden of pregnancy. 10 months pregnant, essential ultrasound a total of 5 or more times, the purpose of different weeks of pregnancy checks are also different. The first time: about 6 to 7 weeks after menopause Early pregnancy ultrasound is very important, do not listen to certain unscientific rumors that early pregnancy ultrasound has an impact on the baby, a short ultrasound is not only not harmful, but also help you monitor: 1, to determine the heart of the fetus, proving that the baby is a live fetus; 2, to determine the size of the fetal buds, and the last menstruation whether or not it matches the baby’s expected date of delivery; 3, to determine whether the pregnancy in the uterus or the uterus is ectopic; 4, to determine whether the baby is single or twin (multiple) fetuses. Vaginal ultrasound is recommended before the 10th week of pregnancy if there is no preeclampsia, which is fast and accurate Second: 11~14 weeks of menopause Also known as Early Pregnancy Screening, it monitors NT, or the thickness of the hyaline membrane at the back of the neck of the fetus, to detect abnormalities such as neural tube defects in the fetus at an early stage. It can also be done at the same time as early pregnancy fetal ultrasound malformation screening (fetal level 3 ultrasound). Some research data show that by checking the nuchal NT thickness during this period and combining it with Down’s syndrome screening, the detection rate of fetal congenital stupidity can be as high as 80% or more. Third: 18~28 weeks of gestation Mid-pregnancy 4D ultrasound malformation screening, which is commonly known as macro-anomaly examination. It systematically screens the fetus for significant malformations. It is usually performed by three-dimensional or four-dimensional ultrasound, which can detect most of the fetal malformations, such as facial, limb, brain, internal organs, cardiac malformations and so on. Fourth: around 28~32 weeks of menopause Late pregnancy screening, fetal position, fetal growth and development assessment, screening for late onset malformations. The function is to supplement the examination of malformations and fetal growth and development, and to check whether the fetus has abnormalities of amniotic fluid and umbilical cord, etc. Fifth: around 38 weeks of menopause Evaluation of fetal size, fetal position, fetal insertion into the pelvis, biophysical scoring, and placental maturity.