Three-year-old babies with low-grade fever and diarrhea need to be alert to viral enteritis, gastrointestinal flu, intestinal tuberculosis and other diseases. 1. Viral enteritis: viral enteritis may be caused by rotavirus, norovirus and other pathogen infections. Patients will have diarrhea, abdominal pain, nausea and vomiting, fever and other manifestations, so the three-year-old baby viral enteritis, will be manifested as low fever and diarrhea. Can be under the guidance of the doctor to be rehydration and other symptomatic supportive treatment, more than a period of time can improve on their own. 2. gastrointestinal cold: gastrointestinal cold is considered to be respiratory syncytial virus, adenovirus, rhinovirus and other infections. The patient will be manifested as diarrhea, fever, nausea and vomiting, and thus the three-year-old baby with gastrointestinal cold will have a low fever and diarrhea symptoms. Under the guidance of the doctor to be symptomatic supportive treatment, such as rehydration, light diet, appropriate rest to help alleviate the condition. 3. Intestinal tuberculosis: intestinal tuberculosis is mainly caused by human tuberculosis mycobacterium infection, patients will have abdominal pain, diarrhea, abdominal mass, fever and other symptoms. If a three-year-old baby with intestinal tuberculosis will have a low fever and diarrhea, you need to go to the infectious disease department in a timely manner, and follow the doctor’s instructions to be anti-tuberculosis drug therapy, commonly used drugs include isoniazid, rifampicin and so on. Clinical cause baby fever, diarrhea, there are many diseases, it is recommended that the three-year-old baby appeared low fever and diarrhea and other manifestations, need to take the baby to the doctor in a timely manner, you can choose the appropriate measures for treatment under the guidance of the doctor.