For three decades, the U.S. childhood immunization schedule was one of the least controversial documents in American medicine. Each year, a committee of outside experts reviewed the evidence, the Centers for Disease Control and Prevention (CDC) published an updated chart and major medical groups endorsed it. In 2026, that consensus has broken down, and the schedule has become the subject of lawsuits, an executive order and dueling recommendations.
How the schedule used to work
Since 1995, the CDC has published an annual immunization schedule for children and teens. The schedule was developed through the Advisory Committee on Immunization Practices (ACIP), a panel of experts that reviewed evidence on each vaccine in public meetings, typically voted on schedule updates each fall and then sent its recommendations to the CDC director for adoption [1]. Until 2024, the American Academy of Pediatrics (AAP) and the American Academy of Family Physicians formally endorsed the CDC schedule each year [1]. The schedule matters beyond the doctor's office. Federal law requires most private health plans to cover ACIP-recommended vaccines without cost-sharing, the Vaccines for Children program uses ACIP's list to decide which vaccines to provide free to eligible children, and many state laws reference ACIP or CDC recommendations [1].
What changed
In June 2025, Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. removed all sitting ACIP members and appointed new ones. The reconstituted committee changed several recommendations later that year, including moving COVID-19 vaccines, and the hepatitis B birth dose for babies whose mothers test negative for the virus, to "shared clinical decision-making," a category in which the decision is made individually between a patient or parent and a clinician [2].
Then, in December 2025, President Trump directed HHS and the CDC to compare the
U.S. schedule with those of "peer, developed nations." On January 5, 2026, the acting CDC director approved a new childhood schedule developed by federal officials without an ACIP vote, based on an assessment written by officials at the FDA and HHS [1]. Compared with the schedule in effect in January 2025, the new version [1]: • Moved hepatitis A, meningococcal ACWY and RSV immunizations from recommendations for all children to recommendations for high-risk children, with shared decision-making for everyone else.
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Moved rotavirus and influenza vaccines from routine recommendations to shared clinical decision-making.
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Reduced the recommended number of HPV vaccine doses to one.
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Incorporated the 2025 ACIP changes to COVID-19 and hepatitis B recommendations. In practice, "shared clinical decision-making" does not mean a vaccine is discouraged. It means the decision is supposed to be made individually through a conversation between a health care provider and a patient or parent. Surveys cited by CRS suggest many people misunderstand the term; nearly half of respondents in one survey incorrectly believed it means it is up to the individual whether to consult a provider at all [1]. The new schedule did not remove any vaccine entirely, and recommendations for measles, polio, whooping cough and other core vaccines were unchanged [1].
The administration's reasoning
HHS's assessment argued that the United States recommends more childhood vaccines than many peer countries, frequently citing Denmark, and that shifting some vaccines to individual decision-making could "restore public confidence" by strengthening informed consent. It also called for more placebo-controlled trials and large studies on vaccine safety [1]. A June 2026 report from the nonpartisan Congressional Research Service (CRS) examined those arguments. It noted that countries weigh different factors when setting vaccine policy, and that Denmark's population is about 6 million compared with about 343 million in the United States. Using rotavirus as an example, CRS reported that before vaccination began in 2006, the virus caused an estimated 55,000 to 70,000 hospitalizations a year among young U.S. children, and that vaccination reduced rotavirus hospitalizations by a median of 80% by 2017 [1]. CRS also found that the assessment did not cite evidence directly showing that shifting recommendations would increase vaccine uptake [1].
The courts step in
The AAP and other groups sued. On March 16, 2026, the U.S. District Court for the District of Massachusetts stayed the new schedule in American Academy of Pediatrics v. Kennedy, reverting the CDC schedule to the version in effect as of May 2025. The court also stayed the appointments of 13 ACIP members named by Kennedy and the votes they had cast in 2025 [1]. The federal government appealed to the U.S. Court of Appeals for the First Circuit on April 29 [1]. On May 29, President Trump issued Executive Order 14407, which declared the HHS assessment and its proposed schedule a "guiding resource" for the federal government and directed the CDC and ACIP to review it and update the schedules "to the extent permitted by law" [1]. HHS had filed a notice to reestablish ACIP's charter on May 19 [1].
A patchwork of guidance
Medical societies have responded by publishing their own schedule. The AAP's 2026 schedule has been endorsed by 12 other medical and health professional organizations, including the American College of Physicians [1][3]. As of January 20, 2026, 28 states, counting Washington, D.C., had announced plans to follow AAP guidance, while some other states moved to adopt parts of the federal schedule [1]. For families, the most immediate question is cost. Insurers represented by the trade group AHIP announced in May that their member plans would continue to cover all ACIP-recommended immunizations with no cost-sharing through the end of 2027 [1]. The executive order also states that vaccines in any category of an ACIP-recommended, CDC-adopted schedule should continue to be covered by private insurance and the Vaccines for Children program [1].
Why it matters
Supporters of the administration's approach argue that giving parents more choice and aligning with other wealthy nations could rebuild trust in public health after the COVID-19 pandemic. Pediatricians and many public health experts counter that weakening recommendations for vaccines with a strong safety record could lower vaccination rates at a time when measles and other preventable diseases are resurging. With the appeal unresolved in the most recent public reports and the executive order directing a new review, the schedule that governs American children's vaccines in 2027 may be decided as much in courtrooms as in exam rooms.
Sources
- 1. Congressional Research Service, "The 2026 Childhood Immunization Schedule," Report R48982, June 11,
- 2026. https://www.everycrsreport.com/reports/R48982.html
- 2. Congressional Research Service, "Changes to CDC Vaccine Recommendations in 2025 and 2026," Insight IN12684, April 28, 2026. https://www.everycrsreport.com/reports/IN12684.html
- 3. American College of Physicians, "ACP Statement of Support for the 2026 American Academy of Pediatrics Immunization Schedule," February 2026. https://www.acponline.org/acp-statement-of-support-for-the-2026 -american-academy-of-pediatrics-immunization-schedule
- 4. HHS, "Decision Requested: Adopting Revised Childhood and Adolescent Immunization Schedule," January 5, 2026. https://www.hhs.gov/sites/default/files/decision-memo-adopting-revised-childhood-adolescent-imm unization-schedule.pdf Information in this article is current as of October 9, 2026. Bracketed numbers refer to the sources listed above.