Try to get the B and MMR vaccines separately and at regular intervals. If vaccinated at the same time, they need to be vaccinated at different sites. Encephalitis B vaccine, also known as live attenuated encephalitis B vaccine, can prevent epidemic encephalitis B virus infection after vaccination. It is suitable for infants at 8 months of age who are healthy and have no contraindications, such as allergies, to be vaccinated, and then booster vaccination is given once at the age of 2 weeks. MMR vaccine, also known as MMR triple vaccine, is suitable for children aged 12-24 months. This vaccine can effectively prevent measles virus, mumps virus and rubella virus infections. In principle, the above two vaccines do not interact with each other in the body, but both of them may cause certain adverse reactions after vaccination, so in order to avoid superimposed adverse reactions, it is not recommended to be vaccinated at the same time, and an interval of about 2 weeks to 1 month can be used in between. If vaccinated together, do not inoculate the same site.