If lactose intolerance occurs, it is essential to adjust the diet and medication. Lactose intolerance can cause an increase in the frequency of bowel movements and changes in stool characteristics in children. If it persists for a long time, it can lead to indigestion and malnutrition. In cases where the symptoms are not severe, reducing the intake of lactose-containing foods and adding lactase can help alleviate the symptoms. However, if the condition has been prolonged and is accompanied by complications such as malnutrition, it is advisable to temporarily stop the intake of formula and dairy products and feed lactose-free formula until the symptoms improve and then resume a normal diet. Lactose intolerance can be congenital or acquired, but the treatment method is through dietary control.