Most of the causes of fetal aortic arch constriction are due to chromosomal abnormalities, viral infections, aortic valve malformations and so on. 1. Chromosomal abnormality: chromosomal mutation during fetal development or chromosomal abnormality during embryo formation may cause fetal aortic arch constriction. 2. Viral infections: Viral infections such as herpes simplex virus in the early stages of pregnancy may cause fetal developmental abnormalities inducing fetal aortic arch constriction. 3. Aortic valve malformation: Fetal aortic valve malformation can also be accompanied by aortic arch constriction. Fetal aortic arch constriction requires prompt medical attention to examine the cause of the disease and to determine the prognosis of the fetus according to the degree of the disease. During pregnancy, pregnant women should pay attention to prenatal checkups, and actively listen to the advice of professional doctors to do comprehensive care and health care work, which can effectively ensure the safety of labor and delivery. During pregnancy, pay attention to rest more, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.