Three months into its tenure, Robert F. Kennedy Jr.’s handpicked vaccine advisory committee has taken down one of its easiest targets.

Today, its members voted to limit the national guidance for a childhood vaccine that has helped protect infants against some of the most dangerous and fast-spreading viral diseases in the United States. If the CDC adopts the committee’s advice, the agency will no longer recommend the combination measles-mumps-rubella-varicella (MMRV) vaccine for kids younger than 4, defaulting their first dose of protection against MMR and chickenpox to two separate shots. The committee also discussed shifting the recommended timing for the first dose of the hepatitis-B vaccine from birth to at least one month old, unless the mother tested positive for the virus during pre

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