A baby with recurrent fever for more than 10 days is a serious case and needs to be taken to the hospital quickly for inpatient treatment. With a fever that lasts so long, the cause of the fever is more difficult to determine, and there are many items that need to be checked. The first and most common cause is recurrent fever due to infection, often chronic infection, which requires checking blood count, C-reactive protein and Mycoplasma pneumoniae, and if there is a bacterial infection, it needs to be treated with intravenous antibiotic drip. In the case of viral infections, intravenous drips of Xiyamphen or Ribavirin can be used. If the infection is Mycoplasma pneumoniae, it can be treated with intravenous drips of azithromycin or erythromycin. In addition, a fever of such a long duration does not exclude fever caused by tuberculosis, malignant tumor or rheumatic immune system diseases, which is often difficult to examine and requires a clear examination of the child and targeted treatment according to the cause, which is more scientific, otherwise it will delay the child’s condition.