6 months old baby suddenly vomit a lot of parents are very worried, the following reasons may lead to 6 months old baby suddenly vomit a lot. A, physiological structure reasons 1, the baby’s stomach is horizontal: the baby’s stomach does not hang down like older children and adults, but is in a horizontal position. This makes the capacity of the stomach smaller and stores less food. 2. The (exit) pyloric sphincter of the stomach is well developed, while the (entrance) cardia sphincter is poorly developed, so it is easy for food to break through the door, leading to spitting up. 3, these physiological spitting up, and so on the baby grows up a bit, the stomach pendulous down, intestinal peristalsis of neural regulation and endocrine gastric acid and proteolytic enzyme function gradually enhanced, spitting up symptoms will gradually ease. Second, improper feeding 1, give the baby too much to eat, or improper position resulting in vomiting. 2.Crying, coughing and moving too much after the baby has just finished drinking milk will also lead to vomiting. 3. During the baby’s feeding, the baby swallows uncoordinatedly due to the mother’s milk being particularly abundant, resulting in too late to swallow. Generally speaking, babies start to spit up when they are half a month old, and it is usually the most serious when they are two months old, and after three months, the number of spitting up is slowly reduced. 1.Medical diseases: gastrointestinal reaction to drugs, gastroesophageal reflux, cardia flaccidity or spasm, constipation, infection, etc. may cause vomiting. 2. Surgical diseases: esophageal atresia, esophagotracheal fistula, esophageal hiatal hernia, hypertrophic pyloric stenosis, gastric torsion, diaphragmatic hernia, congenital megacolon, anal stenosis or atresia can also cause vomiting in newborns. Parents should help their babies clean up when they vomit. If the milk suddenly reverses from the esophagus to the throat, the baby just happens to inhale and accidentally enters the trachea, which is called choking. When the amount is large, it will cause blockage of the trachea and poor breathing, which can even be life-threatening. If the amount is small, it can be inhaled directly into the lungs and cause aspiration pneumonia. For minor spills and vomiting, babies usually adjust their breathing and swallowing actions on their own, so there is no risk of aspiration. Parents only need to closely monitor the baby’s breathing condition and skin color. For massive vomiting, it is recommended to go to the hospital to determine the cause before further treatment.