Three-year-old babies do not eat to exclude digestive system diseases, or repeated respiratory infections, systemic diseases and other pathological factors caused. If pathological factors are excluded, attention should be paid to the formation of poor eating habits. Need to pay attention to the formation of regular eating habits, three meals a day in between not to provide snacks, only provide plain water, each meal eating time should not exceed 20 minutes. Create a pleasant eating atmosphere, do not blame too much, parents should accompany the baby at the table at the same time to eat. Change the food frequently and change the type and style of food to make the baby interested in eating. In addition, children with zinc or vitamin B12 deficiency can also have a decreased appetite, and can supplement zinc and lysine vitamin B12 to increase appetite. If there is indigestion, you can also take oral medication to help digestion, such as Shenmue Oral Liquid and probiotics.