Babies need to be vaccinated with MMR vaccine at 18~24 months of age. MMR vaccine is a class I vaccine, belongs to the national immunization program vaccine, for infants must be vaccinated free of charge, MMR vaccine is also known as measles mumps rubella combined live attenuated vaccine, after vaccination can effectively prevent measles, mumps and rubella diseases, babies need to be vaccinated with MMR vaccine after 18~24 months of birth. After vaccination, babies should stay in the place of vaccination for 30 minutes, there may be fever, swollen lymph nodes, rash and other adverse reactions, usually after a period of time can be relieved on their own, after vaccination, we should pay attention to maintain a light diet, drink plenty of water, more rest, avoid contact with water at the site of vaccination, do not take a bath, to prevent skin infections.