A 4D ultrasound is usually around 400 yuan, but the charges vary slightly from hospital to hospital, and also from region to region. It is best to go to a regular hospital for the examination, so that fetal malformations can be ruled out and the examination results are more accurate. The 4D ultrasound examination is usually done at 24-26 weeks of pregnancy, if the fetus is too big or too small, it will affect the examination results. As long as the baby is developing normally, there is nothing to worry about. It is best to relax during pregnancy, strengthen the diet and nutrition, and suggest appropriate activities, it is best not to be anxious and angry, which can affect the baby’s development. Pay attention to vulva hygiene and change your underwear regularly to avoid gynecological infections. Do not use drugs indiscriminately during pregnancy, so as not to affect the baby’s development, etc.