When is the MMR vaccine typically administered to children?

The MMR vaccine, which protects against measles, mumps, and rubella, is typically administered to children at 15 months of age and then again at 4 years, often referred to as the first and second doses respectively. Administering the vaccine at these ages is crucial because it ensures that children receive effective immunity as their risk of exposure to these diseases increases when they enter preschool or kindergarten around the age of 4.

The schedule aligns with general immunization guidelines aimed at providing early protection against potentially serious diseases. Additionally, administering the MMR vaccine at 15 months allows for an appropriate interval after a child's initial vaccinations and the development of their immune system, while the 4-year booster helps to reinforce this immunity as they start coming into contact with larger groups of peers.