Four-month-old baby fever 38.4 ℃ can be appropriate feeding water, warm water swabbing, medication to lower the temperature, check the cause of the disease. 1. appropriate feeding water: four-month-old baby fever 38.4 ℃ can be appropriate to feed warm water, can make the skin blood circulation accelerated, so that the sweat pores open sweating, sweat secretion increased, sweating has the effect of reducing fever. 2. Warm water bath: 32 ~ 34 ℃ warm water bath, bath before placing an ice pack in the head to cool down, wipe the armpits, groin, popliteal fossa and other blood vessel-rich places, a little stay for a period of time to help dissipate the heat, can reduce body temperature. 3. Drugs to reduce temperature: If you can not get significant relief through physical cooling, fever more than 38.5 ℃, accompanied by vomiting, crying and restlessness and other symptoms, you can use antipyretic drugs, such as acetaminophen and so on. 4. check the cause: four months of the baby fever 38.4 ℃ to observe the changes in the condition, the temperature continues to rise and recurrent episodes, to go to the hospital to check the cause of targeted treatment. Four months baby fever 38.4 ℃ causes more, it is recommended to take the baby to the hospital in time for treatment.