Children’s “cold”, that is, acute upper respiratory tract infection, clinical fever, usually lasts 2 ~ 3 days, up to about 1 week can be fever, but need to pay attention to identify other diseases that cause fever. Acute upper respiratory tract infection, commonly known as “cold”, is a variety of pathogens caused by acute infection of the upper respiratory tract, is a common disease in children, mostly caused by viral infections, such as rhinovirus, respiratory syncytial virus, etc., and some of them can be secondary bacterial infection. Clinical fever may appear, body temperature can sometimes be as high as 39~40 ℃, the course of fever is usually about 2~3 days, some serious may be about 1 week fever. If children have recurrent fever that does not go away, it is important to identify fever caused by other diseases, such as Kawasaki disease. Children with colds and fevers are advised to seek medical attention and active treatment. Use medication as prescribed by your doctor.