At what age are infants given their second dose of the MMR vaccine?

Infants receive their second dose of the MMR (measles, mumps, and rubella) vaccine at the age of 3 years and 4 months, which is typically scheduled during the preschool vaccination. The first dose is given around 12 to 15 months, providing initial immunity against these diseases.

Administration of the second dose is crucial as it helps to boost the immune response, ensuring lasting protection. This timing aligns with other vaccinations recommended during early childhood, reinforcing the importance of maintaining a comprehensive immunization schedule.

In contrast, earlier ages mentioned in the options, such as 8 weeks and 1 year, correspond to other vaccines and not the second MMR dose, while the age of 5 years generally aligns with more booster vaccinations rather than the second MMR dose specifically.