Baby cold fever a few days can reduce the fever with a variety of factors: 1, with the pathogen of infection is closely related, such as rhinovirus infection caused by the common cold 2-3 days can basically reduce the fever, some may be 3-5 days time to reduce the fever, the temperature will not be too high, in addition there are two special types of upper respiratory tract infection: herpes pharyngitis and pharyngeal combined with membrane fever, the fever course of these two diseases is longer, such as herpes Herpes pharyngitis can last up to a week, and the baby’s subjective feeling is very poor, not only fever but also herpes and ulcers in the mouth, which can be very uncomfortable, and naturally the fever can last up to a week. Pharyngeal combined with membrane fever is caused by adenovirus infection, not only pharyngitis can also have conjunctivitis and other manifestations, the fever may be longer; 2, related to whether there are secondary other infections, such as virus-induced upper respiratory tract infection if secondary to bacterial infection, the fever may be longer. If your child has a cold for more than 3 days and the fever does not go away, it is recommended to go to the hospital to see if there are other problems.