A federal judge in Massachusetts blocked key changes made by Health and Human Services Secretary Robert F. Kennedy Jr. to the childhood vaccine schedule, ruling that the alterations violated federal law and bypassed established scientific procedures. The ruling also halted the appointment of new members to the Advisory Committee on Immunization Practices (ACIP), criticizing the lack of expertise among appointees and suspending votes on vaccine recommendations. Medical groups praised the decision as a restoration of science-based policy, while Kennedy’s controversial vaccine agenda continues to face legal challenges and public criticism.