Arterial ductus arteriosus in babies may be associated with heredity, preterm labor, viral infection during pregnancy, exposure to radioactive substances, medication and other factors. 1. Genetic factors: If the baby has chromosomal abnormalities, such as trisomy 21, trisomy 15, etc., it may be combined with arterial ductus arteriosus. 2. Premature birth: Some premature babies have arterial ductal smooth muscle dysplasia, which can easily cause arterial ductus arteriosus. Smooth muscle dysplasia makes preterm infants less sensitive to partial pressure of oxygen than full-term infants. As a result, preterm infants have a higher chance of developing patent ductus arteriosus, which may be accompanied by symptoms such as respiratory distress syndrome. 3. Viral infection during pregnancy: If a pregnant woman suffers from a viral infection in the early stages of pregnancy, it may cause the fetus to develop cardiovascular malformations, which may lead to arterial ductus arteriosus, etc. In this case, rubella is the most common cause of arterial ductus arteriosus. Among them, rubella, mumps and herpes virus infections during pregnancy are risk factors for arterial ductus arteriosus in babies. 4. Exposure to radioactive substances: If the fetus is exposed to harmful radioactive substances in the mother’s body or after birth, it may affect the development of its descending aorta and pulmonary artery, causing conditions such as arterial ductus arteriosus. 5. Drugs: If the pregnant woman has been exposed to teratogenic drugs such as phenytoin sodium during pregnancy, or has taken anticancer drugs, it may cause the baby’s arterial ductus arteriosus. Baby arterial ductus arteriosus, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.