Nine-month-old baby fever for two days has been recurring, can be seen in infectious diseases (such as toddler emergency rash), non-infectious diseases (such as Kawasaki disease), treatment needs to be decided according to the cause. 1. Infectious diseases (1) Acute rash in young children: caused by human herpesvirus type 6 or 7 infection, clinical recurrence of fever, some may have swollen lymph nodes, and most of the fever subsides in 3~5 days and the rash comes out. Treatment should be reasonable to reduce fever, if the temperature exceeds 38.5℃, acetaminophen should be used to reduce fever; rest, give appropriate amount of water and nutritious and easy-to-digest diet. (2) Urinary tract infection: the above symptoms may appear, and the symptoms of urinary tract irritation, such as urinary frequency and urinary pain, are not obvious in this age group, and routine urinalysis can assist in the diagnosis. Treatment requires active use of antibacterial drugs, such as cefaclor and other anti-infective treatment, pay attention to clean the vulva, drink more water. 2. Non-infectious diseases: such as Kawasaki disease, also known as cutaneous mucocutaneous lymph node syndrome, can appear the above phenomenon, can be accompanied by hard swelling of the hands and feet, rash and other symptoms, the diagnosis is clear, can be used after the use of gammaglobulin, aspirin and so on. Nine-month-old baby fever for two days has been recurring can also be seen in other diseases, need to be evaluated by specialists to clarify the cause and treatment.