1.5 year old baby sleep suddenly vomiting, clinical possible causes are digestive system diseases, central system diseases, overfeeding and so on. 1. Digestive system diseases: clinically common such diseases are acute gastroenteritis, acute appendicitis and bacillary dysentery, etc. The typical manifestations of the above diseases are abdominal pain, diarrhea, vomiting and loss of appetite. 2. Diseases of the central system: when the child’s brain is infected or there is a tumor in the brain, the nerves in the brain are compressed and the child experiences projectile vomiting. 3. Eating too much: If the child eats a lot of food before going to bed, the gastrointestinal tract can’t bear the burden and the symptoms of vomiting appear. 1.5 year old baby sleep suddenly vomiting, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.