Babies suddenly spit up frequently, and position change related, but also may be due to pyloric spasm, meningitis and other diseases. 1. Physiological factors: due to the baby’s short esophagus, the stomach presents a horizontal position, if the parents suddenly pick up the baby after feeding, or change the position, resulting in a change in the stomach position movement, increased intra-abdominal pressure. In the above reasons, it will cause the baby suddenly spit up frequently phenomenon. 2. Pyloric spasm: the pylorus is a relatively narrow part of the human digestive tract, if the baby eats too much, too fast and other factors, it will lead to pyloric spasm. The baby will have irregular vomiting. 3. Meningitis: Meningitis can be triggered when the baby enters the body due to external pathogens caused by factors such as decreased immunity. Meningitis in infants and young children is usually characterized by purulent meningitis, which can cause fever, vomiting, impaired consciousness and other symptoms. The baby suddenly spit up frequently, there may also be other reasons, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.