Four-dimensional baby pulmonary artery stenosis, according to the degree of pulmonary artery stenosis, consider the continuation of pregnancy or termination of pregnancy, the degree of the condition is mild, continue pregnancy, serious cases recommended termination of pregnancy treatment. Fetal pulmonary artery stenosis is generally congenital heart disease, due to abnormal embryonic development or genetic factors, fetal pulmonary artery stenosis to simple pulmonary valve stenosis is more common, but also may be the arterial ductus arteriosus, tetralogy of Fallot and other cardiac anomalies. Mild pulmonary stenosis, usually no obvious clinical symptoms, fetal period may be self-cure, can not be self-cure the birth of the need for treatment, but generally does not affect the normal growth and development, you can continue to continue the pregnancy. Moderate to severe pulmonary stenosis requires surgical treatment after birth. Exertional dyspnea may occur during growth and development, and pulmonary hypertension due to pulmonary stenosis may become more pronounced with age, resulting in heart failure and loss of ability to live and work, etc. In this case, it is important to carefully consider whether to continue the pregnancy. Fetal pulmonary stenosis detected by 4D ultrasound needs to be handled with a combination of the extent of the condition and the family’s opinion.