Four-dimensional ultrasound, known as four-dimensional color ultrasound diagnostic instrument, is the most advanced color ultrasound examination and diagnostic equipment, also known as four-dimensional ultrasound. Fetal color ultrasound is one of the prenatal checkups that a woman must do when she is pregnant. A six-month-old fetus is roughly in the middle of pregnancy at 24 weeks of gestation, when it is necessary to go to the hospital for a 4-D ultrasound screening. Through the four-dimensional ultrasound examination, it can clearly diagnose whether the fetus has developmental malformations, because at this time the fetus’s organ development is more perfect, the amniotic fluid volume is large, and it is most suitable for the screening of fetal malformations. During the 4D ultrasound examination, there are many things to pay attention to, such as keeping an empty stomach, not being too nervous, and cooperating with the doctor and other precautions. In the sixth month of pregnancy, the pregnant woman’s abdomen is already relatively large, and the fetus is also relatively large, if you eat before the examination may lead to too much food in the stomach, which will affect the ultrasound image, so it is best to keep an empty stomach. Don’t eat too much gas-producing food the night before, such as potatoes, soybeans, milk, etc. Gas-producing food will lead to a large amount of gas in the abdomen, which will also affect the ultrasound image and lead to errors. If you are too nervous, it will also have a certain effect on the fetus, such as excessive fetal movement, fetal position, etc., the position of the fetus under the ultrasound will not be clear, which can also cause errors, so before doing the examination to relax. Many new mothers are worried that the examination will cause damage to the fetus, although ultrasound has a certain amount of radiation, but there is no impact on the fetus and harm, so do not worry too much. Strictly according to the time of the maternity examination to do fetal ultrasound examination, if found that the fetus has deformities or other conditions, early intervention, but also a good choice for eugenics.