Infants with ventricular septal defects should be careful to avoid colds, choking and loud crying. 1. Avoid catching cold: ventricular septal defect is caused by the incomplete development of the ventricular septum in embryonic stage, which is the most common congenital heart disease. Babies with this disease should avoid catching colds, which may cause fever and aggravate the burden on the heart. 2. Avoid choking: choking can lead to inhalation of foreign bodies, causing a violent dry cough, and may also develop aspiration pneumonia, resulting in breathing difficulties, aggravating the burden on the heart, and may be serious and life-threatening. 3. Avoid loud crying: oxygen consumption will increase when the baby cries loudly, which will also increase the burden on the heart function and cause danger. If the diagnosis of ventricular septal defect is confirmed, you should communicate with your doctor in time, and for those who cannot recover by themselves should be treated as soon as possible to avoid life-threatening situations.