A federal judge issued a stay pausing major elements of Health and Human Services Secretary Robert F. Kennedy Jr.'s overhaul of the Advisory Committee on Immunization Practices (ACIP) and the CDC's revised childhood vaccine memo. The injunction halted 13 ACIP appointments and the CDC's January change to the childhood schedule pending litigation outcomes. The ruling, issued in American Academy of Pediatrics v. Kennedy and reported by multiple outlets, blocks ACIP votes and forces the cancellation of a scheduled meeting. Plaintiffs argued the appointments violated federal advisory committee procedures; the court found procedural defects sufficient to pause implementation. The order creates short‑term regulatory uncertainty for vaccine policy and ACIP‑driven recommendations. Health organizations and public‑health stakeholders are preparing for appeals and regulatory follow‑up while emphasizing continuity of evidence‑based immunization practices.