3 months baby fever 37.7 degrees is often due to indigestion, respiratory infections, etc., can be physical cooling treatment, at the same time need to clarify the diagnosis, to give targeted treatment, such as indigestion caused by probiotics and other medicines to follow the doctor’s instructions to ease. 1. indigestion: due to drinking too much milk and improper care and other conditions caused by indigestion, may make 3 months baby fever 37.7 degrees, usually can follow the doctor’s advice to use bacillus subtilis bacillus granules and other drugs to relieve indigestion. 2. upper respiratory tract infection: 3 months baby fever 37.7 degrees may also be due to upper respiratory tract infection, if it is caused by bacteria, you can use antibiotics such as cefixime, if it is caused by viral infection, usually take symptomatic treatment can be used, if necessary, can use antiviral oral antiviral medication for treatment. The treatment of the cause at the same time, 3 months baby fever 37.7 degrees, can take physical cooling treatment, such as the head of the antipyretic paste, warm water bath, etc.. There may be other reasons for your 3 month old baby to have a fever of 37.7 degrees, so it is recommended that you go to the hospital in time for a complete examination to determine the cause of the illness, and then give targeted treatment or therapy.