Dry heaving and nausea in four-month-old babies may be related to gastroesophageal reflux, indigestion, infection and other factors. 1. Gastroesophageal reflux: four-month-old babies may be related to gastroesophageal reflux if the above situation occurs occasionally, for example, if the baby eats more, which may lead to the food that should have gone into the stomach to reflux into the esophagus. 2. Indigestion: If the baby does not pay attention to the way of feeding, and often feeds the baby when he/she is hungry or crying, the above situation may also occur. 3. Infection: dry heaving and nausea in babies may also be related to infectious factors, such as colds, acute gastroenteritis, encephalitis B and so on. Four-month-old baby dry heaving nausea, there may be other reasons, it is recommended to go to the hospital in a timely manner to carry out relevant examinations, to clarify the cause of the disease and then actively symptomatic treatment.