Pediatric influenza A usually can reduce fever in 3~5 days, each child has differences. Pediatric influenza A is a disease caused by influenza A virus infection, which can be transmitted through respiratory droplets, and children with low resistance are easily infected. The most common symptom of pediatric influenza A infection is fever, followed by coughing, coughing up phlegm, vomiting, sore throat, crying and so on. Because it is a viral infection, there is a certain degree of self-limitation, the course of the disease in 1 week to 10 days or so, the general resistance of normal children in 3 to 5 days can be fever, the condition gradually recovered. For preterm babies and children with low resistance, it may take longer, and even later, there may be secondary bacterial infections, and the fever may last for more than 10 days. It is recommended that the duration of the disease be shortened by active antiviral and symptomatic treatment when pediatric influenza A is detected.