Drowsiness with vomiting and diarrhea in babies is usually considered to be due to infections such as bacterial or rotavirus. Bacterial or rotavirus infections can lead to enteritis, which manifests itself as vomiting, diarrhea, fever, and lethargy. Babies with vomiting and diarrhea are prone to dehydration and electrolyte disorders, which can lead to lethargy. It is usually considered that severe dehydration has occurred, resulting in poor mental status. Dehydration in children can appear in the sockets of the eyes, the skin has no elasticity or decreased elasticity, decreased urine output and other manifestations, resulting in the child’s acid-base balance disorders, electrolyte disorders and other serious conditions. If there is metabolic acidosis is manifested in deep breathing, lethargy, mental depression and other symptoms, at the same time may appear convulsions, cardiac arrhythmia, hypotonia and so on. Baby vomiting and diarrhea drowsiness and other causes, need to go to the hospital, by the physician according to the child’s condition for treatment, they can not randomly use drugs.