Two months baby fever drowsiness is usually considered abnormal, can be seen in respiratory diseases, gastrointestinal diseases, intracranial infections and other conditions, need to actively seek medical attention to clarify the cause of the disease. 1. respiratory diseases: such as acute upper respiratory tract infection, the baby can appear fever symptoms, when the temperature rises the baby can appear breathing, heart rate increases, often accompanied by mental depression, and even more sleep, parents can describe it as “drowsiness”, this kind of babies reasonable intervention symptomatic antipyretic, when the body temperature is normal, the above limitations can be relieved. 2. Digestive diseases: such as acute diarrhea, can be caused by viral infections, the baby may appear fever, diarrhea symptoms, the course of the disease if there is severe dehydration, may also appear the above phenomenon, not normal, should be early intervention. 3. Intracranial infections: such as bacterial meningitis, viral encephalitis, etc., for 2-month-old babies can appear repeated fever, can present high fever, often accompanied by poor mental response, some can appear sleepy phenomenon, clinical often have convulsions, perfect lumbar puncture examination can assist in the diagnosis. It is not normal, serious cases can appear brain hernia and other critical life-threatening, need to actively seek medical attention. Two months baby fever lethargy, it is recommended that the hospital as soon as possible to clarify the cause of the disease, by a professional physician for treatment.