Parents and pediatricians in the United States are in uncharted territory. As front pages catalog a dizzying array of domestic and international chaos, the U.S. measles outbreak quietly continues to spread at alarming speed; in 2025, we finished the deadliest flu season for children on record outside of a pandemic, only to stumble into a new record-breaking season this year; Covid and RSV continue to surge; diseases that were largely vanquished before many of us were born now threaten a comeback.

Earlier this month, the United States announced, under the purview of longtime anti-vaccine activist Robert F. Kennedy Jr., that some vaccines would only be available to high-risk infants, while others would be available under “shared clinical decision-making”—previously a little-known term that meant a vaccine’s benefits were unclear and could only be given on doctors’ orders. The changes reduce the vaccination schedule of the U.S., once a global leader, by a full third. Never before has the United States made such drastic changes to its vaccination schedule or any of its public health guidance so rapidly, and all without input from outside experts or the public.

The new recommendations will likely make it harder for children to get vaccinated—either because providers follow the new guidelines and don’t offer the vaccine to some patients or because insurance companies and federal programs stop covering the vaccine if it is offered. Confusion may also play a major role. It’s not always clear who is “high risk” and what “shared clinical decision-making” even means, in legal and practical terms. After all, vaccination, and all health decisions, are always shared decisions—with careful explanations of the benefits and the side effects. (No one is bursting into the exam room with a needle and arm restraints, despite anti-vaxxers’ paranoid fantasies.) Parents and providers are still wading through bewildering announcements to understand what, exactly, has changed, and then we’re bombarded with a firehose of misinformation on social media (and, increasingly, in traditional media).

But these changes to the recommended vaccine schedule will also cause another problem: They won’t only take away certain vaccines from kids who no longer qualify. All vaccines may now face supply and demand issues.

“We’ve never had a change for this many vaccines all at once,” Eric Hall, assistant professor of epidemiology at Oregon Health and Science University, told me. Everyone is trying to understand what happens next, and “honestly, we don’t really know.” But, he said, this is the likely scenario: The abrupt change in recommendations will introduce confusion and misunderstanding among parents and providers.........

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