At approximately what age are MMR vaccines typically given?

• A. 12 months
• B. 6 weeks
• C. 4 years
• D. 18 months

Answer: (A)

Measles, mumps, and rubella vaccine is scheduled to start around 12 months of age because by that time maternal antibodies have declined enough and the child’s immune system can mount a reliable response to a live attenuated vaccine. Giving it earlier, such as at 6 weeks, often results in poor seroconversion and is not recommended. The second dose is given later, typically around 4 to 6 years, to boost immunity. An age like 18 months is after the usual first-dose window, and 4 years is associated with the second dose rather than the initial dose. Therefore, the typical starting age is about 12 months.