If your baby has a fever after receiving the hepatitis A vaccine, you need to judge how to deal with it according to the specific situation. Usually, if the fever after vaccination is not very high and the fever duration is not very long, and the temperature is lower than 38.5℃, and the baby’s mental state and appetite are good, no special treatment is usually needed. After vaccination, the immune response is strong and the fever is high, accompanied by poor mental state, and the baby shows a very uncomfortable state, you can use antipyretic drugs, such as acetaminophen or ibuprofen, and continue to pay attention to drink water regularly and reduce clothing appropriately to promote natural heat dissipation from the body surface. If the fever persists for more than 3 days or is accompanied by other obvious abnormalities, it usually has little to do with the vaccine and requires a doctor’s visit to determine other possible causes and to deal with them as appropriate.