3 months infant fever 38.2 ℃ may be upper respiratory tract infection, you can first physical cooling, physical cooling is ineffective when the use of antipyretic drugs. Infant fever 38.2 ℃, may be due to upper respiratory tract infection, the disease is mostly self-limiting disease. First of all, you can carry out physical cooling, unzip thick clothes, use warm water to wipe the body, use a warm towel on the forehead, and at the same time to appropriate supplemental water, conducive to sweating and heat dissipation. If physical cooling is ineffective and the body temperature exceeds 38.5℃, antipyretic drugs such as acetaminophen can be used to reduce fever. At the same time, the body temperature should be measured regularly, every half an hour to measure the temperature, observe the change of body temperature, if the body temperature still does not fall after taking antipyretic drugs, should go to the hospital in time for treatment. When a 3-month-old baby has a fever of 38.2 ℃, it is recommended to consult a doctor in time for formal treatment.