Children with lactose intolerance exhibit symptoms of diarrhea and must be treated through diet and medication. Lactose intolerance indicates an insufficient secretion of lactase by the child's digestive system. Therefore, the diet should consist of light, liquid, and easily digestible foods, avoiding hard-to-digest and lactose-containing foods. Additionally, dietary adjustments are necessary. If the child is breastfed or formula-fed, it is advisable to temporarily switch to lactose-free formula until symptoms subside and then gradually return to a normal diet. It is also important to use probiotics and related supportive medications. Attention should be paid to the child's stool, skin turgor, and urine output, as prolonged diarrhea can lead to malnutrition and electrolyte imbalances, with severe cases possibly resulting in dehydration. Hence, ongoing monitoring is essential.