Babies spitting up large mouthfuls of milk may be caused by over-rapid feeding, or it may be caused by indigestion, acute gastroenteritis and other diseases. 1. Eating too quickly: If parents feed their children too quickly, it will lead to inhalation of large amounts of air, which will lead to the phenomenon of spitting up a large mouthful of milk. 2. Dyspepsia: dyspepsia is caused by a combination of factors, including gastrointestinal dyskinesia and poor gastric tolerance of food. The child will have symptoms such as fullness and bloating after meals, middle and upper abdominal pain, reflux, etc. The child’s gastrointestinal tract is not safely developed, so eating too much will cause indigestion, which will lead to spitting out milk in large gulps. 3. Acute gastroenteritis: acute gastroenteritis is mainly caused by bacterial, viral and other pathogenic infections, the main symptoms of children with diarrhea, vomiting, abdominal pain, accompanied by fever, fatigue, loss of appetite and other symptoms. The baby spit up a lot of milk, there may be other reasons, it is recommended to go to the hospital in time, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.