The measles vaccine schedule for children

Children in the United States receive the measles vaccine as part of the MMR vaccine, which protects against measles, mumps, and rubella. The standard schedule calls for two doses: the first dose at 12 to 15 months of age, and the second dose at 4 to 6 years old, before school entry.

Some children receive the second dose earlier — as soon as 28 days after the first dose — if they are traveling internationally or during a measles outbreak. Your child's doctor can advise whether an accelerated schedule makes sense for your family.

Infants younger than 12 months are not routinely vaccinated because maternal antibodies (protection passed from the mother during pregnancy) can interfere with the vaccine's effectiveness. However, infants traveling internationally may receive an early dose at 6 to 11 months, followed by the standard two-dose series later.

Key Takeaways

  • The first MMR dose is given at 12 to 15 months of age, and the second at 4 to 6 years old.
  • Children can receive the second dose as early as 28 days after the first if needed for travel or during an outbreak.
  • Infants under 12 months are not routinely vaccinated but may receive an early dose before international travel.
  • The MMR vaccine is a live attenuated vaccine, meaning it contains a weakened form of the virus that triggers immunity without causing measles.

What happens at the vaccination appointment

Before your child receives the MMR vaccine, the doctor or nurse will ask about your child's health history, any allergies, and whether anyone in your household is severely immunocompromised. This information helps determine whether the vaccine is appropriate at that time.

The vaccine is given as a single injection, usually in the arm or thigh. Most children experience minimal discomfort. After the shot, your child may stay in the office for 15 minutes so staff can monitor for any immediate reactions, though serious reactions are rare.

Common side effects after the MMR vaccine

Most children have no side effects or only mild ones. The most common reactions appear 7 to 14 days after vaccination and include a mild rash, slight fever, or swollen glands. These reactions are temporary and typically resolve within a few days without treatment.

Some children develop a brief fever (usually under 103°F) in the first few days after vaccination. You can manage fever with acetaminophen or ibuprofen as directed by your child's doctor. A mild rash may appear on the trunk or face and fades without scarring.

Serious side effects are extremely uncommon. Severe allergic reactions occur in fewer than one per million doses. If your child develops difficulty breathing, swelling of the face or throat, or severe dizziness within minutes of vaccination, alert the medical staff immediately.

Who should not receive the MMR vaccine

Children with a severe allergy to gelatin or the antibiotic neomycin should not receive the MMR vaccine. Additionally, children who are severely immunocompromised — such as those with untreated HIV, certain cancers, or those taking immunosuppressive medications — should not receive this live vaccine without consulting their doctor first.

Pregnancy is a reason to delay the vaccine. The MMR vaccine should not be given to pregnant people or those planning to become pregnant within the next month, as the vaccine contains a live virus. However, the vaccine is safe to give while breastfeeding.

If your child received another live vaccine recently (such as varicella for chickenpox), the MMR vaccine should be given on the same day or separated by at least 28 days. Your child's doctor can coordinate the timing if multiple vaccines are needed.

Catching up if your child missed a dose

If your child did not receive the MMR vaccine on schedule, it is never too late to catch up. Children and adolescents who missed their doses can receive the vaccine at any age, following the same two-dose schedule with at least 28 days between doses.

Teenagers and adults who have no record of vaccination or immunity can also receive the MMR vaccine. This is particularly important for people planning to travel internationally or those in healthcare settings where measles exposure is a risk.

School and childcare requirements

Most states require proof of MMR vaccination for school entry, typically before kindergarten. Childcare facilities often have the same requirement. Your child's school or childcare provider will specify which vaccines are needed and the deadline for submission.

Medical exemptions are available for children who cannot receive the vaccine due to documented medical conditions. Some states also allow religious or personal belief exemptions, though the rules vary significantly by state. Contact your state or local health department to learn what exemptions are recognized in your area.

Frequently Asked Questions

Can the MMR vaccine give my child measles?

No. The MMR vaccine contains a weakened form of the virus that cannot cause measles. A mild rash that appears 7 to 14 days after vaccination is not measles and is not contagious. True measles causes a much more extensive rash and higher fever.

What if my child has a fever on the day of vaccination?

A mild fever (under 101°F) is not a reason to delay vaccination. However, if your child has a moderate to high fever or is seriously ill, the doctor may recommend postponing the vaccine until recovery. This ensures the vaccine works properly and makes it easier to tell if any fever afterward is from the vaccine or the illness.

Does my child need a booster dose after the second MMR vaccine?

No. Two doses of the MMR vaccine provide lifelong protection for most people. A third dose is not part of the routine schedule. However, during an outbreak, people who received only one dose in the past may be advised to get a second dose if they have not already.

Can my child receive the MMR vaccine if they have a peanut allergy?

Yes. The MMR vaccine does not contain peanuts and is safe for children with peanut allergies. If your child has a severe allergy to gelatin or neomycin (an antibiotic), mention this to the doctor before vaccination, as these are the only vaccine components that cause true allergic reactions.

What records do I need to keep after vaccination?

Keep your child's vaccination card or record from the doctor's office. Schools, childcare facilities, and healthcare providers may request this documentation. Many states also maintain vaccination records in a registry that you can access online or by contacting your health department.