When a baby has a high fever that goes down and comes back up, the first thing you need to do is to give your child fever-reducing treatment. You need to measure the body temperature and make sure it is below 38.5 degrees. Once the temperature exceeds 39 degrees, it is easy to have febrile convulsions, and you can take oral ibuprofen suspension or acetaminophen pellets. If there is recurrent high fever, the medication can be repeated once after an interval of 4-6 hours. However, if the child’s temperature rises particularly quickly, not to 4 hours and then rises above 39 degrees, it is necessary to cross-use antipyretic drugs to be more effective and also to reduce the side effects of the drugs. For the first fever, you can take oral ibuprofen suspension. For the second fever, you need to switch to acetaminophen suspension or acetaminophen pellets to reduce the fever. For the third fever, you need to switch to ibuprofen suspension again, which will have much fewer side effects and is safer for your child to use.