How many weeks is four?

Four-dimensional color Doppler ultrasound is done at about 24-26 weeks of pregnancy. This period is the best period. The size of the fetus is just right, and the amount of amniotic fluid is the most. The purpose of four-dimensional color Doppler ultrasound is to check whether the fetus has organ abnormalities. All color Doppler ultrasound throughout pregnancy, four-dimensional color Doppler ultrasound is the most important one. Check whether the development of various organs of the fetus is normal, whether there are abnormalities in various organs and systems, focusing on whether there are abnormalities in the brain, whether there is hydrocephalus, and whether the development of each ventricle is normal; The second focus is on the heart, whether the heart has congenital heart disease, whether there is structural abnormality of the heart; The third focus is whether there is cleft lip and palate, and whether there are abnormalities of limbs; In addition, check whether the abdominal organs of the fetus are normal, etc.