Preventing the measles in babies.
Because of the fast-spread of the highly contagious virus, the CDC says babies between the ages of six to 11 months should get the vaccine before they travel internationally.
The CDC normally recommends parents wait until about 12 months to get their babies vaccinated.
The changes come as global concerns for measles are surging.
As of Monday, the CDC said there were 704 cases of measles nationwide, and that 71 percent of those infected were not vaccinated.
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Doctors recommend two doses of the MMR vaccine, which covers measles, mumps and rubella.
Doctors typically give the first dose between 12 and 15 months, and the second between four to six years.
The CDC said if you were vaccinated with two doses, you have a 97 percent chance at preventing the measles.
Currently, the number of measles cases is the highest since 2000, which is when the disease was eradicated in the United States.
The update comes as the CDC is kicking off National Infant Immunization Week.