The U.S. CDC’s Advisory Committee on Immunization Practices (ACIP), reconstituted under Health and Human Services Secretary Robert F. Kennedy Jr., voted to revise vaccine recommendations. The panel recommended that children under four should not receive the combined MMRV vaccine and suggested consulting healthcare providers before COVID-19 vaccinations for young children. A planned vote on delaying the hepatitis B birth dose was postponed amid debate. The changes reflect ongoing tensions in U.S. vaccine policy and have prompted concern among former public health officials.