MMR is a two-shot series of vaccines usually given during childhood. A child should receive the first shot when he is between 12-15 months, and the second when he's between 4-6 years of age.If you're not sure if you have had the diseases or the vaccines (prior to 1971 it was given in three separate shots), you can get the MMR vaccine as an adult.Talk to your doctor about it if: child should receive the first shot when he is between 12-15 months, and the second when he's between 4-6 years of age.