The child has spit up first need to confirm whether the child is spitting up or vomiting, for the newborn, due to its gastrointestinal physiological structure of the special, that is, the small baby’s stomach is horizontal, the stomach muscles are not well developed, cardia flaccid, so in the milk more or swallow more air, easy to appear from the corner of the mouth overflow of a small amount of milk, which is the normal overflow of milk, is not a pathological condition. If your baby has severe milk spillage, with obvious crying and farting, you need to be alert to lactose intolerance or milk protein allergy. If your baby has obvious and frequent projectile vomiting, and in some cases milk may come out of the mouth or even from the nostrils, you need to take into account the age of your baby and the frequency of the projectile vomiting to determine the cause of the problem. For small children, the first thing to be excluded is structural anomalies of the digestive tract, such as congenital hypertrophic pyloric obstruction or gastric torsion, which need to be confirmed by the doctor’s examination and ultrasound and other imaging tests. For older children, it is necessary to consider whether there is a gastrointestinal viral infection, gastroesophageal reflux, gastrointestinal bacterial infections, neurological disorders, etc., which need to be analyzed in accordance with the combination of the child’s other manifestations. Analyze the cause of the illness and consider how to deal with it after the cause has been identified. For spitting up, most children will get better after they can sit, while a few children with more severe spitting up may continue to do so until they start toddling or even after they are weaned.