The common causes of dry heaving and nausea in four-month-old babies include physiological factors, gastrointestinal dysfunction, craniocerebral diseases and so on. In terms of treatment, the main thing is to carry out general treatment and drug treatment. 1. Physiological factors: If it is caused by improper feeding, such as feeding too much milk at one time, or inhaling a lot of air when feeding, resulting in four-month-old baby dry heaving, nausea. To address this situation, you should correct the poor feeding practices, small amounts of meals, and avoid feeding the child immediately after crying, which is conducive to relieving the symptoms. 2. Gastrointestinal dysfunction: If it is due to drinking cold milk or the abdomen is cold and other factors, leading to gastrointestinal dysfunction, caused by the four-month-old baby dry heaving, nausea. The application of probiotics such as Bifidobacterium bifidum and Bacillus subtilis under the guidance of a doctor can play a role in regulating the intestinal flora, thus relieving the above symptoms. 3. Cranio-cerebral diseases: If it is caused by encephalitis, meningitis, brain tumors and other cranio-cerebral diseases, resulting in four-month-old baby dry heaving, nausea, such as encephalitis, when the intracranial pressure is increased, we need to consult a doctor in a timely manner, under the guidance of the application of mannitol, glycerol fructose and other dehydrating drugs to reduce cranial pressure. Four-month-old baby dry heaving nausea may also be related to other causes, it is recommended to seek timely medical attention to clarify the cause of the disease. Parents should avoid blindly to the child abuse of drugs, need to follow the doctor’s instructions reasonable use of drugs.