If the baby has sour and smelly stools, it is often considered that the child has indigestion, incomplete digestion, and the food ferments itself, and this time, in addition to the sour and smelly stools, the child will also have abdominal distension, etc. In this case, it is mostly considered to be caused by accumulation of food, indigestion, etc. The sour and smelly stools caused by food accumulation: many times babies eat indigestible food, it will lead to food accumulation, bloating, flatulence, too much food in the digestive tract is not effectively digested will be fermented to produce gas, while the sour and smelly stool situation. Acidic stools caused by indigestion: This is similar to the case of pent-up food, which also results in acidic stools. Breastfeeding problems, the mother does not pay attention to the scientific diet during breastfeeding may cause indigestion in the baby, the baby may also appear sour stools after eating breast milk, this time it is recommended that the mother should eat lightly during breastfeeding. The child will also be cold, which can lead to foul-smelling stools, so it is necessary to keep the child warm, and the mother should not eat some cold substances. The above is a brief introduction to the causes of sour stools in babies, when the baby appears in this situation, the mother does not have to worry too much, in addition to dietary attention, if still so, it is recommended to seek medical attention.