Baby has been 38.2 ℃ suggests that has been a low fever, the cause of the fever has not been effectively controlled, the common cause is a viral infection, other may also be bacterial, mycoplasma and other infections, you should take the child to the hospital pediatric emergency department or pediatric outpatient clinic as soon as possible to check, laboratory blood C-reactive protein to understand the status of infection. If there is a basis for bacterial infection, oral antibiotic treatment is usually required, such as oral amoxicillin or cefaclor, and if it is a viral infection it is usually symptomatic treatment. You should also take measures to reduce fever. Low fever can be physically cooled, such as putting cooling patches on the forehead, neck and underarms, taking a warm bath or using warm water to rub the baby, giving him/her proper hydration, and wearing loose cotton clothes to help the child dissipate heat and sweat to reduce fever.