Symptoms of ventricular septal defect in infants are as follows: 1. Symptoms: If the mother had intrauterine infections within the first three months of pregnancy, was exposed to significant amounts of radiation, took teratogenic medications, or had metabolic disorders, these factors could contribute to the condition. The patient is prone to recurrent respiratory infections and exhibits symptoms of palpitations, shortness of breath, fatigue, and excessive sweating. If these symptoms worsen after physical activity or crying and are accompanied by cyanosis, congenital heart disease should be considered. Cyanosis can intensify during severe crying episodes, pneumonia, or heart failure in infants, and may be accompanied by a hoarse voice. 2. Physical signs: Notable findings include a bulging in the precordial area and diffuse apical impulse. A soft, systolic murmur can be heard between the second and third ribs along the left margin of the sternum.