Worried about the measles? Most babies get their first dose of the measles, mumps, and rubella (MMR) vaccine between 12 and 15 months old. But, if there's a measles outbreak in your area – or you're traveling somewhere with an outbreak – you can ask your pediatrician about getting your baby an extra dose of the MMR vaccine earlier than that. Pediatrician and BabyCenter Medical Advisor Dr. Phil Boucher walks us through why this is a great option under certain circumstances.