A meeting of the CDC's vaccine advisers got off to a chaotic start on Friday with a delayed vote on one vaccine and a redo of a vote from Thursday. Elijah Nouvelage/Getty Images

Vaccine advisers to the US Centers for Disease Control and Prevention voted 11-1 to delay a vote on changes to a newborn hepatitis B shot. It was a surprise twist after a lengthy discussion on the hepatitis B vaccine typically delivered to newborns shortly after birth.

The committee had planned to consider a new recommendation that would wait to give newborns a dose of the hepatitis B vaccine until they are at least a month old. Currently, babies are given this shot at birth, usually before they leave the hospital.

The birth dose of hepatitis B vaccine has been recommended in the United States since 1991. Afte

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