Atrial septal defect is a relatively common congenital heart disease, which is related to genetic factors, environmental pollution, exposure to radiation during pregnancy, and viral infections.

The severity of atrial septal defect in babies varies. Babies with mild symptoms are generally not easily detected, often being discovered during physical examinations or when other diseases prompt stethoscopic evaluation, revealing heart murmurs. Babies with severe conditions may experience significant hypoxia after birth, exhibiting cyanosis, rapid breathing, cyanotic lips, weak crying, reduced feeding, with symptoms becoming more pronounced during crying. These babies have lower immunity, making them prone to recurrent respiratory infections, and in severe cases, can lead to heart failure. Therefore, it is important to provide extra care in daily life, ensure proper nutrition, enhance physical health, and opt for surgical correction as soon as conditions permit.