4 months old baby, if the forehead is obviously hot, armpit temperature more than 37.3 degrees belongs to the symptoms of fever. Fever by temperature, if the temperature 37.3 degrees to 38 degrees belongs to the fever in the low fever; 38.1 degrees to 39 degrees belongs to the fever in the moderate heat; 39.1 degrees to 41 degrees belongs to the high fever; 41 degrees or more, belongs to the ultra-high fever. Accompanied by nasal congestion, runny nose, sneezing, sore throat and other symptoms, most of the fever caused by upper respiratory tract infections, you can take pediatric aminophenol xuanamin granules orally, which can treat and alleviate various symptoms caused by the common cold and influenza. If the child’s temperature exceeds 38.5 degrees, you can take ibuprofen drops, suitable for infants and young children to reduce fever, can play a rapid role in reducing fever. When your child has a fever, drink plenty of water, pay attention to rest, and take vitamin C supplements to prevent dehydration caused by high fever.