The ventricular septal defect is 8 millimeters, which is considered a medium-sized defect. This type of defect is relatively large and will not heal on its own. Moreover, this ventricular septal defect requires timely surgical treatment, and close observation is needed in daily life. If the child is prone to catching colds, leading to repeated pneumonia, then prompt surgical treatment is necessary without delay. If the child's growth and development are not affected and there are no repeated incidents of pneumonia, close monitoring can be considered. Surgery to repair the ventricular septal defect can be considered after the child reaches two years of age. Otherwise, if delayed, it may lead to heart failure and complications such as pulmonary hypertension, severely affecting the quality of life and endangering the patient's safety.