Infant Bleeding Cases Jump as Vitamin K Shot Refusals Hit New High

Newborn vitamin K refusals have been climbing for years. Now there are numbers to show what that means for babies.

Two studies published November 5 in JAMA and JAMA Pediatrics connect a steady rise in parental refusals of the standard newborn vitamin K shot to a measurable increase in life-threatening bleeding among U.S. infants. The findings land at a moment when medical distrust is running high, and the trend shows no sign of slowing.

The first thing to understand about the vitamin K shot is what it isn't. It's not a vaccine. It's a nutrient injection, given within hours of birth, because newborns don't arrive with enough vitamin K to support normal clotting. That's been understood for decades. Providing the shot at birth has been standard of care since 1961, and the American Academy of Pediatrics has recommended it since the same year.

What the new research makes clear is how badly things can go without it. According to data reported by NBC News citing a Reuters analysis of more than one million births nationwide by health data company Truveta, refusals of the shot jumped by more than 57% between January and June 2026, rising from 5.2% to 8.1% of newborns. A separate study published in JAMA last December by researchers at Children's Hospital of Philadelphia found that more than 5% of U.S. babies didn't receive the shot in 2024, a 77% increase since 2017, as reported by the Detroit News.

The clinical stakes are concrete. Infants who didn't get the shot had a 47% higher risk of bleeding in the first six months of life compared with those who did, according to Healthline's coverage of the studies. They also had more than twice the risk of intracranial bleeding, which can kill. The Detroit News reported the studies' finding that for every 114 newborns who don't receive the shot at birth, one additional bleeding event occurs. The CDC's own figures, cited by USA Today, put the risk at 81 times more likely to develop severe bleeding for unvaccinated newborns, a number that has sat in public health materials for years while refusal rates climbed anyway.

What's driving the refusals? Pediatricians who study this point to a mix: vaccine hesitancy bleeding over into hesitancy around any injection given at birth, misinformation spreading on social media, parental concern about the preservative in the formulation, and a broad erosion of trust in public health institutions. A 2022 AAP policy statement found refusal was linked to parents not understanding why the shot was needed, believing it was unnecessary, or worrying about injection pain. Births outside hospital settings were also associated with higher refusal rates, according to USA Today's coverage.

The Washington Post noted that researchers stopped short of claiming causation, but that the correlation between rising refusals and rising bleeding rates is hard to dismiss. Dr. Steven Woolf, an epidemiologist at Virginia Commonwealth University whose study appeared in JAMA Pediatrics, told the Detroit News the simultaneous rise in both trends is significant even without a proven causal link.

Meanwhile, the federal tracking infrastructure simply isn't there. As NBC News reported, the CDC does not currently track vitamin K refusal rates or vitamin K deficiency bleeding events nationally. A Department of Health and Human Services spokesperson told Reuters the agency still recommends the shot but declined to say whether tracking would begin. In June, Representative Kim Schrier of Washington and Senator Angela Alsobrooks of Maryland both called on the CDC to start collecting that data.

For nurses and pediatricians talking to new parents in the delivery suite, this isn't a research problem. It's a conversation that happens in real time, with a family that may have already made up its mind. The shot takes seconds. The bleed, if it comes, can take everything. The gap between those two facts is where this story lives.

Sources cited:
- JAMA Pediatrics (via Washington Post) (https://www.washingtonpost.com/health/2026/11/05/infant-bleeding-surged-last-year-parents-refuse-vitamin-k-shot-newborns/)
- NBC News / Reuters (https://www.nbcnews.com/health/health-news/us-infant-bleeding-episodes-jump-vitamin-k-refusals-rise-studies-rcna607800)
- Detroit News (https://www.detroitnews.com/story/news/nation/2026/11/05/us-infant-bleeding-episodes-vitamin-k-refusal-studies/92628721007/)
- Healthline (https://www.healthline.com/health-news/infant-bleeding-cases-surge-parents-refuse-vitamin-k-shot-newborn)
- USA Today / Yahoo News (https://www.yahoo.com/news/articles/more-parents-refusing-shot-prevents-222626620.html)