The best way to prevent hepatitis A is to get vaccinated, and the hepatitis A vaccine is the vaccine used to prevent hepatitis A. Currently in China, the hepatitis A vaccine is of great importance among childhood vaccinations and has become one of the main vaccines given to children. In May 2008, the hepatitis A vaccine was included as one of the expanded immunization vaccines. At the same time, some provinces and cities have provided free hepatitis A vaccination to the public. The two main types of hepatitis A vaccines available on the market are inactivated hepatitis A vaccine and live attenuated hepatitis A vaccine. Due to the difference in preparation principles, there are differences in effectiveness and safety. Inactivated vaccines have better stability compared to live attenuated vaccines. Both inactivated and attenuated vaccines achieve immunity by invading the body and causing an immune response, thus causing the body to develop an immune memory. It is normal to have fever after hepatitis A vaccination. It is mainly because the vaccine is an active virus and there may be some side effects after vaccination. It is recommended to give your baby more water and let him rest more. In addition, you can use raw potato slices on the eye of the needle to absorb the lumps. If the fever is high, it depends on the situation. Seek medical attention promptly if it is above 38.5℃. Go to the hospital for a checkup to see what is causing it. If it is caused by a viral infection, the high fever will be recurrent and you can take ribavirin. If it is a bacterial infection, you can take cephalosporins. If it’s less than 38.5℃, you can not take medicine, observe it, and rub your feet with alcohol to lower the temperature. In addition, make sure your child drink more warm water and lie in bed for a while. And every once in a while, let the child take the temperature to see if it is high or cooled down. Usually if the temperature is not high, it will recover after 1-2 days. Therefore, when parents find that their baby has a fever, they can use physical methods to help cool down the baby appropriately. If your baby has a fever because of the vaccination, parents should not worry too much. If your baby has a longer fever, you can take him to the hospital for a detailed physical examination.