Children who eat less, do not consume enough energy, and do not have enough calories will lose weight. The following points should be noted in the treatment: First, look for the cause of the child’s reluctance to eat and eat less, which is commonly a micronutrient deficiency. For example, children with zinc deficiency tend to have low appetite and should be given zinc supplements such as lysine glucosamine or zinc sulfate syrup. Second, the child may have upper digestive system problems, such as chronic gastritis, gastric ulcer, reflux gastroesophagitis, etc., and should see a pediatric gastroenterology clinic and be treated accordingly. If there is a basis for H. pylori infection, anti-H. pylori treatment with omeprazole, amoxicillin or clarithromycin is required. Third, if the child eats less because of poor digestion and weak spleen and stomach function, you can take Chinese medicine to eliminate food and strengthen the spleen and stomach, such as Si Mo Tang Oral Liquid or Infant Spleen Health San, etc. Fourth, some children’s intestinal micro-ecosystem is not well established, poor digestion can be supplemented with probiotics, such as bifidobacteria, Saccharomyces boulardii, etc.