Four-dimensional ultrasound has not been able to pass may be caused by fetal organ malformation, fetal position is not good, and other reasons, need to be through further examination, under the guidance of the doctor treatment and treatment. 1. Fetal organ malformation: four-dimensional ultrasound has not been able to pass may be due to problems with the structure of the fetal organs, to further do non-invasive DNA, amniocentesis biopsy, to determine whether the fetus has chromosomal malformations, if the problem is more serious to be timely induced under the advice of the doctor to deal with. 2. Fetal position is not good: Fetal position is not good may also lead to the four-dimensional ultrasound structure does not show clear, you can under the guidance of the doctor to appropriate walking and then re-examination. If you can’t get through the 4D ultrasound during pregnancy, you should have a further checkup to clarify the cause of the problem and then give appropriate treatment under the doctor’s guidance.