The cost of 3D ultrasound is about 400 yuan, and the fee varies according to the level of the hospital, so it is best to do the examination after the appropriate consultation. The main purpose of 3D ultrasound is to understand whether there are any abnormalities in the development of the fetus through 3D imaging. For example, the internal organs, the development of the limbs, the development of the head and the soft tissues can basically be understood more clearly through 3D ultrasound examination. This is an important examination during pregnancy, and it is recommended that this examination be done between 23 and 28 weeks of pregnancy. In addition, when doing the 3D ultrasound examination, you must pay attention to the fact that it is best to wear a tunic that separates the dress from the pants so that it will not be inconvenient, which may be inconvenient if you wear a dress.