Babies spitting up after breastfeeding are commonly seen in the following situations: 1. Overflowing milk, mostly during breastfeeding because of feeding inhalation of air, resulting in overflowing milk and abdominal discomfort, can be improved by holding the baby straight after breastfeeding and patting the back with the head resting on the shoulder to expel too much air from the stomach. At the same time, pay attention to let the baby suck the areola as much as possible when breastfeeding to avoid inhaling too much air. As the baby grows older, the overflow will be significantly reduced after 6 months of age.2. In congenital pyloric hypertrophy or stenosis, most of them have frequent vomiting about 20 days after birth, and vomit within half an hour after each feeding, vomiting as stomach contents, without milk flaps or milk residue, and should be promptly seen at the hospital and surgically treated if necessary.