The measles, mumps and rubella vaccine (MMR) protects children from these three diseases in one injection. It was started in 1988.
These diseases can cause children lots of pain and can sometimes lead to more serious illnesses.
So it's important for them to be protected, or vaccinated, against the diseases, especially against measles - the most serious one.
The vaccine is very effective for nine out of 10 children, but others sometimes need more than one dose.
The first injection is given between 12 and 15 months of age. The top up, or booster, is given at between three and five years.
So what's the MMR vaccine?
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