Baby repeated and persistent fever need to be alert to the following aspects: 1, viral fever, common 39 ℃ or more high fever, common cold children with good mental status, no convulsions, headache, violent crying, not accompanied by coughing, coughing up sputum, no sore throat, not herpes, this cold situation symptomatic antipyretic, usually 3-5 days is also good. In addition, respiratory syncytial virus, adenovirus, hand, foot and mouth disease infected children, its high fever is often accompanied by mental lethargy, red mouth and lips, there are mouth ulcers or herpes, fever is difficult to use a single antipyretic suppression, you need to have a good supply of ibuprofen and acetaminophen, you can take it alternately, and most of the fever can be suppressed by this way. In this case, it is best to go to the hospital to check the relevant viral antigen to confirm the diagnosis, so as to facilitate symptomatic treatment.2. Infectious fever, that is, bacterial infections, the child is often depressed accompanied by crying and noise, the whole body will be white or red, there can be infected rash, regular daily fever, fever, heavy symptoms, difficult to use antipyretics to reduce the fever, this case needs to be as early as possible hospital consultation.