Babies are due for the hepatitis A vaccine when they reach the appropriate age. However, parents find that their baby has been running a fever since he/she received the hepatitis A vaccine, and this is when parents get worried. What should I do if the fever does not go away? It is normal to have fever after hepatitis A vaccination, mainly because the vaccine is an active virus and there may be some side effects after vaccination. It is recommended to give the baby more water and let the baby rest more. In addition, you can use raw potato slices on the eye of the needle to absorb the lump. If the fever is high, it depends on the situation, if it is above 38.5℃, you should seek medical attention in time. It is important to note that you should not take a bath after the vaccination, wait at least 4 hours before washing, but you can use a hot towel to rub the body. If your child has a high fever above 38.5℃, it is best to go to the hospital to check what causes it. If it is caused by a viral infection, the fever will be recurrent and you can take ribavirin, and if it is a bacterial infection you can take cephalosporins. If it is less than 38.5 ℃, you can not take medicine, observe, you can use alcohol to wipe the feet to cool down. In addition, be sure to let the child drink more warm water, lie in bed for a while, and let the child take the temperature every once in a while to see if the temperature has increased or cooled down, if the temperature is not high after 1 or 2 days will recover. Precautions for hepatitis A vaccination 1. Those with fever or persistent fever and a basal body temperature of more than 37.5°C are not easily vaccinated against hepatitis A. Consider vaccinating against hepatitis A after the body temperature has returned to normal. 2. Patients with neurological diseases, severe rickets, severe malnutrition or congenital immunodeficiency should not be vaccinated with hepatitis A vaccine. 3. Patients who are suffering from asthma, serum sickness or allergic urticaria are also not suitable for hepatitis A vaccination and should consider postponing or withholding vaccination. 4.Patients who are known to be allergic to some drugs such as penicillin, sulfonamide and formalin are also not suitable for hepatitis A vaccination. 5. Hepatitis A vaccine is not recommended for allergic persons, especially those who are known to be allergic to one of the components of the hepatitis A vaccine or who have had allergic reactions to previous vaccinations are prohibited from receiving the hepatitis A vaccine. When you find that your baby has a fever, you can use physical methods to help cool your baby down. If your baby has fever after vaccination, parents should not worry too much. If your baby has fever for a long time, you can take him to the hospital for a detailed physical examination.