Fetal aortic stenosis is generally a localized anatomical abnormality caused by developmental disorders of the heart and great vessels during development. It is generally recommended that pregnant women undergo an ultrasound examination of the fetal heart at around 20-24 weeks of pregnancy, a time when abnormalities in fetal heart development can be detected earlier. Depending on the severity of the abnormality, a specialist will be able to advise on whether to continue or terminate the pregnancy. Fetal aortic stenosis is a congenital cardiovascular anomaly that can be detected early in pregnancy. If it is not serious, it can be further observed and treated after the birth of the fetus, but if it is more serious, it is usually recommended to terminate the pregnancy in order to minimize the impact on the pregnant woman.