The sour smell in the baby’s vomit is a sign of gastrointestinal dysfunction and is related to the child eating too much at night. The baby’s age is relatively small, the gastrointestinal function is relatively weak, the gastrointestinal tract is at rest at night when sleeping or the peristalsis of the gastrointestinal tract is slowing down, eating too much may appear nausea, vomiting, and the vomit has a sour smell. 1, vomiting caused by indigestion: baby digestive system is not fully developed, so if they eat some raw and hard to digest food will appear indigestion. The main manifestation of indigestion is the loss of appetite, nausea, vomiting, and vomiting out of the food has a distinct sour smell. 2, vomiting caused by paediatric oesophagus: paediatric oesophagus is also a very common situation, the child’s uncontrolled satisfaction of food is easy to cause the situation of paediatric oesophagus, and paediatric oesophagus may cause fever and vomiting. 3, eat too much vomiting: many parents will feed their babies before they go to bed, but because the baby’s gastrointestinal function is not fully developed, there is not enough storage capacity of food, plus the baby is in a lying down state when sleeping, so when the digestive enzymes inside the gut and food reaction, the gut will make a series of reactions, the most obvious reaction is vomiting The most obvious reaction is vomiting. In addition, there are some serious cases, such as intestinal obstruction, appendicitis, etc. can also be accompanied by vomiting In this case, you can first massage the abdomen to improve gastrointestinal function, during this period as far as possible to eat some easy-to-digest food, and the amount should be small, you need to take oral digestive drugs for treatment, such as multi-enzyme tablets or lactobacillus tablets. If it does not improve or the symptoms are more serious, go to the hospital in time to see a doctor