If a 3-year-old baby has a fever caused by a bacterial infection, you need to combine the baby’s symptoms and laboratory tests to determine how to treat it. If the baby’s general condition is relatively good, his mental appetite is also good, other symptoms like cough are not strong, and the fever is only low or occasionally high, then you can take oral antibiotics and some Chinese medicine to clear the fever for treatment. If the repeated high fever is very close to each fever, the effect of antipyretic drugs is not good, accompanied by the baby’s mental symptoms are not good and the cough is serious, or the inflammatory index is very high, then oral drugs may not be effective, and need to be treated with antibiotics under the guidance of a doctor. In addition, you should give your baby more water to help reduce the fever better when the body fluids are well hydrated.