13 months baby fever can be seen in infectious diseases (such as toddler rash, acute upper respiratory tract infection, etc.), non-infectious diseases (such as Kawasaki disease, leukemia, etc.), the specific need to analyze the baby’s situation to determine. 1. Infectious diseases: (1) toddler acute rash: the disease caused by herpes virus infection, clinical fever can occur, mostly presenting high fever, often the general condition can be, can appear in the neck and other lymph node swelling, often fever 3~5 days rash appeared, body temperature is normal. (2) Acute upper respiratory tract infection: mostly caused by viral infections, can be secondary to bacterial infections, clinical fever, accompanied by nasal congestion and runny nose and other symptoms. 2. Non-infectious diseases: (1) Kawasaki disease: also known as cutaneous mucocutaneous lymph node syndrome, clinical symptoms can be manifested as fever, rash, hard swelling of the hands and feet and chapped lips, etc. Some of them can be seen as cardiac coronary dilatation and so on. (2) acute leukemia: clinical fever can appear, often fever type is variable, can be accompanied by skin and mucous membrane bleeding, anemia and other symptoms, part of the lymph nodes and hepatosplenomegaly. There are many causes of fever in 13-month-old babies, and it is recommended to consult a specialist for a comprehensive assessment to determine the cause.