The move could shift long-standing practices of how and when children are immunized in the United States.

At the first meeting of a controversial new group of vaccine advisers to the US Centers for Disease Control and Prevention, the committee announced new plans to study established vaccine guidelines.

The new members of US Health Secretary Robert F Kennedy Jr's panel of vaccine advisers will review long-approved immunisation schedules for children and teens. The seven members of the Advisory Committee on Immunization Practices (Acip) met for the first time on Wednesday, weeks after Kennedy ousted all 17 of their predecessors.