If a 4.5-month-old child has a fever, treatment measures can be chosen according to the cause and the degree of fever. First of all, we need to take timely measures to lower the temperature of the child, if the child’s temperature is around 37.5 ℃, usually do not need special cooling treatment, you can let the child drink more water. If the child’s temperature is between 37.5-38.5 ℃, you can apply antipyretic patches to lower the temperature. If the child’s temperature exceeds 38.5℃, ibuprofen suspension can be taken for cooling treatment. Secondly, we need to clarify the cause of the child’s fever, need to go to the hospital for blood tests, if it is clearly caused by bacterial infection, in the cooling at the same time, but also to take antibiotics such as cefixime for treatment. If the fever is caused by viral infection, you can take oral antiviral solution for treatment.