Most of the infant stools stink with improper feeding or indigestion, the common causes are as follows: 1, if the baby is breast-fed, there is a sour stool, consider the maternal food starch and sugar content more. 2, if the baby is mixed feeding, consider because the starch and sugar in the milk powder can not be fully digested, so the stool is sour and even bloated. Replace the food containing less sugar and starch, gradually improve. 3, over-eating can also lead to sour stools, the baby does not know hunger and full, the mother fed the baby too much, resulting in indigestion. Infant spleen and stomach function is weak, once consumed too much, residual food is not fully digested, resulting in sour-smelling stools. 4, too much protein-containing food will lead to sour stools, these proteins can neutralize the gastric acid in the stomach, reducing the acidity of the gastric juice, so that the protein can not be fully digested and absorbed, coupled with the decomposition and metabolism of bacteria in the intestinal cavity, making the stool sour smell. Don’t panic when you smell your baby’s stool smells sour, change your feeding style in time, give your baby a light diet, avoid stimulating factors and don’t eat hard food that is hard to digest. Drink more warm water, reduce the amount of food, with appropriate massage abdomen, most of the symptoms will soon be relieved.