When Can My Baby Get The Measles Vaccine?

The first MMR dose is routinely recommended for babies at 12 through 15 months of age, with an early dose option for infants 6–11 months old.

You might assume the measles vaccine comes as a single shot given once, but the timing actually depends on your baby’s age, travel plans, and local measles activity. Many parents hear about outbreaks and wonder if their infant can get the vaccine sooner than the well-known one-year mark.

The short answer is that the standard timeline is well established, but exceptions exist for specific situations. Here’s what the evidence says about when the MMR vaccine can be given, along with the reasoning behind the official recommendations.

The Routine MMR Schedule for Infants

The first dose of the measles, mumps, and rubella (MMR) vaccine is routinely given between 12 and 15 months of age in the United States. The American Academy of Pediatrics (AAP) and the CDC both support this timing as the standard for most children.

A second dose follows later, typically at age 4 through 6 years, before a child starts kindergarten. This two-dose series provides strong protection: the first dose is about 93% effective at preventing measles, and the second dose pushes that to roughly 97%, according to CDC data.

In the United Kingdom, the NHS offers the MMRV vaccine (which also protects against chickenpox) at 12 months and again at 18 months. The routine first dose at one year of age is consistent across most countries with strong immunization programs.

Why 12 Months Is the Standard Starting Point

You might wonder why babies can’t get the MMR vaccine earlier than their first birthday. The main reason involves the immune system’s maturity and the presence of maternal antibodies.

Newborns carry antibodies passed from their mother during pregnancy, which offer some temporary protection against measles. These maternal antibodies can interfere with the vaccine’s ability to trigger a strong immune response if given too early. By 12 months, those antibodies have mostly faded, allowing the vaccine to work effectively.

Research suggests that vaccinating before 9 months in high-risk settings can reduce measles-related illness, but it may blunt the immune response to later doses. That’s why the standard schedule aims for the sweet spot at one year.

The Risk of Delaying Past 15 Months

While a single study doesn’t prove cause and effect, it adds weight to the recommendation not to delay unnecessarily.

When an Early Dose Makes Sense: Travel and Outbreaks

Infants between 6 and 11 months of age can receive an early dose of MMR before international travel, ideally at least two weeks before departure. The CDC’s routine MMR schedule specifically recommends this for any travel to areas where measles is circulating.

During a local measles outbreak, state health officials may also recommend an early dose for infants as young as 6 months, even without travel plans. This is a situational decision based on community risk.

Here’s a quick comparison of the different scenarios:

If your baby receives an early dose for travel or outbreak, that dose does not replace the routine series. They’ll still need two more doses after their first birthday to complete the full protection.

Catch-Up Vaccination for Delayed or Missed Doses

If your child missed the routine first dose and is now older than 15 months, the CDC catch-up schedule provides clear guidance. The first dose can be given any time after age 12 months, and the second dose must come at least 28 days after the first.

For children who start the series late — for example, at age 7 to 11 months (not for travel) — the CDC recommends a slightly different track. That early dose does not count, and the routine two-dose series should start at 12 to 15 months, with the second dose at least 4 weeks later. A third (final) dose may be given at age 12–15 months or 8 weeks after dose 2.

1. Check your child’s age: If your baby is over 12 months and hasn’t received an MMR dose, schedule it as soon as possible.
2. Know the minimum interval: Two doses must be separated by at least 28 days for children 12 months and older.
3. Don’t count an inadvertent early dose: If a dose was given before 12 months for any reason other than travel, it doesn’t count toward the routine series. Start over at 12 months.
4. Follow outbreak alerts: During active measles spread in your area, watch for recommendations from your local health department, which may allow early vaccination for infants 6–11 months.

The AAP provides a complete immunization schedule on its website, and your pediatrician can help you align your child’s timeline with the latest official recommendations.

Weighing the Benefits and Trade-Offs of Early Vaccination

Giving the MMR vaccine before 12 months can offer earlier protection, which matters most during outbreaks or when traveling to regions where measles is common. However, the immune response to an early dose may not be as robust as a dose given at 12 months or later.

A review published in PMC notes that while early vaccination has the potential to reduce measles-related illness and death in high-risk settings, it may blunt the immune response to subsequent doses. This doesn’t mean it’s unsafe — it means you should plan for the full three-dose series if your baby gets an early shot.

Per the outbreak early dose option from Utah’s health department, state officials may authorize early MMR for infants as young as 6 months during a local outbreak. This is a case-by-case decision, not a blanket rule.

Here’s a summary of when each option is typically recommended:

The Bottom Line

The standard MMR first dose at 12–15 months remains the best approach for most babies, but early doses are available for travel or outbreak situations. Delaying past 15 months may increase measles risk, so try to stay on schedule unless your pediatrician advises otherwise.

Your child’s doctor is the best resource for matching the vaccination timeline to your baby’s specific health history, upcoming travel, and local measles activity. They can also help you navigate catch-up schedules if any doses were missed.