The symptoms of indigestion in infants are currently considered to be the result of a combination of multiple factors. The vast majority of indigestion in babies is functional and is divided into two subtypes: postprandial discomfort syndrome (manifested by postprandial fullness or early satiety) and epigastric pain syndrome (manifested by epigastric pain or burning sensation). Specific manifestations are as follows: 1, loss of appetite: the accumulation of undigested food fermentation will reduce the appetite of the child, and the child will appear to not eat or eat very little. 2, post-prandial fullness: the baby after eating a normal amount of food appears after the meal fullness discomfort, young babies because they can not express abdominal pain may be manifested as crying. 3, early satiety: the baby will feel full after eating less food than normal. 4, restlessness at night: due to the internal heat generated by the accumulation of food, the baby sleeps restlessly at night, the body keeps tossing and turning during sleep, crying, dryness and heat. 5, bad breath: the baby’s breath smells sour and rotten, especially in the morning after waking up, which is due to the stagnation of milk food; observe that his tongue may be thick, yellow and greasy or the tongue juice is a little red. 6, abnormal bowel movements: irregular bowel movements, abnormal stool status, most children will have diarrhea and diarrhea or constipation due to gastrointestinal digestive problems and other symptoms. 7.Generating sound: Due to the disorder of digestive organism function, some food residues are left inside the digestive tract, and these residues will produce gas through microbial fermentation, and these gases will cause symptoms such as bloating of the child’s stomach, burping, loud sounds from the abdomen and many farts.