A federal vaccine advisory committee this week is expected to discuss whether newborns should still get the hepatitis B vaccine — the first shot found to prevent cancer. Federal health recommendations now suggest that all babies be vaccinated against the liver infection in their first day of life, but U.S. Health Secretary Robert F. Kennedy Jr.’s committee on Thursday is expected to change that. Changing the recommendation would contradict previous public health advice, and some medical and public health experts are alarmed. It’s not clear what the committee is considering, but the American Academy of Pediatrics will still urge a birth dose.