Ventricular septal defect is also known as ventricular septal defect, neonatal ventricular septal defect diameter of 7mm, belongs to the moderate ventricular septal defect, such as no shortness of breath, heart failure, pulmonary hypertension is not considered serious. Neonatal ventricular septal defect is a common congenital heart malformation, in our country accounts for about 50% of pediatric congenital heart disease, according to the size of the defect can be divided into mild, moderate and severe, in which the neonatal ventricular septal defect diameter of 7mm belongs to the moderate, usually no symptoms, when strenuous exercise may appear shortness of breath or even dyspnea symptoms. It should be noted that ventricular septal defects are prone to complications of bronchitis, pulmonary edema, subacute bacterial endocarditis, and congestive heart failure. Therefore, when newborns with ventricular septal defects, they should go to regular hospitals in time, and improve the examination and treatment under the guidance of doctors.