Generally speaking, 4-month-old babies with fever are often seen in sepsis, upper respiratory tract infections, pneumonia and other diseases, and can be treated with general treatment, symptomatic treatment and causative treatment as prescribed by the doctor. 1. General treatment: If the baby has a fever, it can be given to adjust the room temperature, physical cooling treatment. Usually can strengthen the nutrition, pay attention to rest, if necessary, intravenous high nutritional support therapy. 2. Symptomatic treatment: if the baby cough, fever, cough and other manifestations, can be given oxygen, sputum, ventilator-assisted ventilation and other symptomatic supportive treatment. Serious cases can be strictly under the guidance of the doctor to use ibuprofen antipyretic treatment. 3. Treatment: Whether sepsis, upper respiratory tract infection or pneumonia, mostly due to infection. Due to the imperfect development of the immune function of 4-month-old babies, fever can occur after infection, in this case, you can improve the blood routine, ultrasensitive C-reactive protein, calcitoninogen and other tests, such as the consideration of bacterial infections may be, can be prescribed to be anti-infective antibiotics, such as cefazoxime treatment. If you consider viral infection, there is no specific drug treatment, can be rehydration, budesonide nebulization and other symptomatic supportive treatment. Clinical causes of fever are many, the above drugs are recommended to be used under the guidance of a doctor. If your baby has a fever, it is recommended to go to the hospital to find out the cause and get timely treatment.