A one and a half year old child with diarrhea clinically if considered a case of pediatric enteritis. It is usually recommended to continue the diet to meet the energy needs of the child’s organism, to fill the consumption caused by the disease, and to favor the recovery of the disease. Reasonable adjustments are made according to the particular condition of the disease, individual digestion and absorption function and usual eating habits. Those with severe vomiting should temporarily fast for 4-6 hours, without water, and resume breast milk and familiar diet as soon as possible. Feed the child an age-appropriate diet from small to large amounts, from thin to thick. Viral enteritis can have secondary disaccharidase deficiency, for suspected cases can be changed to legumes, starchy foods, or sugar formula to reduce diarrhea, after diarrhea stops gradually restored to nutrition, resume the diet, and add meals once a day for 2 weeks. If diarrhea does not improve after the application of a double sugar diet. Food allergies, such as the possibility of milk allergy, should be considered, and allergic foods should be avoided, or an amino acid or hydrolyzed protein formula diet can be used.