By LAURAN NEERGAARD and MIKE STOBBE

It’s normal for parents, or anyone, to have questions about vaccinations — but what happens if your pediatrician urges a shot that’s under attack by the Trump administration ?

That’s getting more likely: The nation’s leading doctors groups are in an unprecedented standoff with federal health officials who have attacked long-used, lifesaving vaccines.

The revolt by pediatricians, obstetricians, family physicians, infectious disease experts and internists came to a head when an advisory panel handpicked by Health Secretary Robert F. Kennedy Jr. urged an end to routine newborn vaccination against hepatitis B, a virus that can cause liver failure or liver cancer.

That vaccine saves lives, helped child infections plummet and has been given safely to t

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