The MMR vaccine generally refers to the MMR3 vaccine. If your child has a mild fever after receiving the MMR vaccine, it is usually normal and requires no special treatment. However, if the fever persists or is accompanied by severe discomfort, the child should go to the hospital promptly. MMR vaccine can be used to prevent three acute respiratory infectious diseases, namely measles, rubella and mumps. Due to the differences in individual resistance, some children may have mild fever or rash after receiving MMR vaccine, which is usually not contagious and can be relieved on its own, if special medication is needed. If the body temperature is higher than 38.5℃ after vaccination, you can use a hot towel to wipe the child’s neck, forehead and other parts of the body, and take proper rest, drink plenty of water, pay attention to keep warm, while parents should closely observe the child’s spirit, appetite and other conditions. However, if the body temperature is high and persistent, or accompanied by serious discomfort, then you should consult a doctor and use antipyretics such as acetaminophen under the guidance of a doctor to prevent hyperthermia convulsions. After a child has a fever after receiving MMR vaccine, parents should treat the child according to his or her physical condition, the degree of fever, etc., and seek medical attention and treatment in a timely manner if necessary.