If a nine-month-old baby’s fever reaches 38.2℃, we deal with it in two steps, the first step is to dissipate the heat, undress him, use warm water to rub his body, and lower the temperature of the room a little bit to about 27℃. But if the body temperature remains the same, or even continue to go up, reaching more than 38.5 ℃, to carry out the second step, give him some antipyretic drugs, we have two common antipyretic drugs, one is Merlin, the other is Tylenol, both of which can be eaten, it is used a criterion is the body temperature in more than 38.5 ℃, while the interval between the two medications should be greater than 4-6 hours. Therefore, if a nine-month-old baby simply has a fever and other mental conditions are okay, the treatment at home is physical cooling and medication to lower the temperature, and if there is no significant relief after the above treatment you need to go to the hospital to see a doctor.