Deep Dive: Declining Newborn Vitamin K Shots and Rising Infant Bleeding — Background, What Changed, Viewpoints, and What to Watch

Deep Dive: Declining Newborn Vitamin K Shots and Rising Infant Bleeding — Background, What Changed, Viewpoints, and What to Watch

Parenting · 6 November 2026 · Deep dive

A new study of more than 5.2 million U.S. births shows that refusal of the routine newborn vitamin K injection has more than doubled since 2017, and infants who miss it face a 47% higher risk of bleeding in their first six months of life—including more than double the risk of brain hemorrhage.

Background

Vitamin K is essential for blood clotting. Newborns are born with low stores, and breast milk contains little vitamin K. Without supplementation, some infants develop vitamin K deficiency bleeding (VKDB), which can cause life-threatening intracranial or gastrointestinal hemorrhage in the first weeks or months of life.

Since the 1960s, the American Academy of Pediatrics has recommended a single intramuscular vitamin K injection within 24 hours of birth. The shot is not a vaccine; it is a vitamin. Oral drops are an alternative in some countries but are less reliable for preventing late VKDB.

Rates of refusal were low for decades. That began to change in the mid-2010s amid broader vaccine hesitancy and parental concerns about newborn interventions.

What Changed

A retrospective cohort study published in JAMA on 5 November 2026 analyzed 5,240,780 infants born at 35–43 weeks’ gestation between 2017 and 2025 across hospitals contributing to the Epic Cosmos dataset.

• Nonreceipt of intramuscular vitamin K rose from 3.1% in 2017 to 6.8% in 2025.

• Infants who did not receive the shot had a 47% higher risk of any bleeding event by 6 months (288.0 vs 185.9 per 10,000; adjusted RR 1.47).

• Risk of intracranial bleeding more than doubled (33.0 vs 13.2 per 10,000; adjusted RR 2.43).

• Risk of death with concurrent bleeding during the birth hospitalization was also more than doubled (2.9 vs 1.1 per 10,000).

• The number needed to harm is approximately 114: one additional bleeding event for every 114 newborns who miss the shot.

A companion analysis of more than 11 million infants found that vitamin K deficiency bleeding rose 347% over the same period. Incidence of vitamin K deficiency itself climbed from 11.8 to 37.3 per 100,000.

Competing Viewpoints

Public health and pediatric perspective: The data make the risk concrete. The shot is safe, inexpensive, and highly effective. Rising refusals track with vaccine hesitancy and post-COVID erosion of trust in routine newborn care. Clear communication of absolute risks (about 1 extra bleeding event per 114 uninjected infants) can help parents decide with evidence rather than anecdote.

Parental autonomy and caution perspective: Some parents prefer to avoid injections, seek “natural” birth experiences, or distrust institutional recommendations after COVID-era policy disputes. Oral vitamin K is promoted by some midwives and alternative providers. A Swedish study showed oral drops still carried higher bleeding risk than the injection, but some families accept that trade-off.

Practical middle ground: Hospitals and clinicians can document refusal carefully, offer oral regimens with clear counseling about incomplete protection, and ensure follow-up for any signs of bleeding (unusual bruising, bleeding from the umbilicus, pale stools, lethargy, or bulging fontanelle).

What to Watch Next

• Whether refusal rates continue to climb or stabilize after these JAMA findings.

• State and federal responses: some lawmakers have already called for better tracking of VKDB.

• Hospital policies on counseling and documentation.

• Whether insurance or quality metrics begin to flag high-refusal facilities.

• Ongoing measles and RSV season activity, which continues to dominate headlines, but this quieter rise in preventable bleeding is now quantified.

Parents who have already declined the shot should watch for bleeding signs and contact their pediatrician promptly. Those expecting a baby can discuss the evidence with their care team before delivery.

Sources: JAMA (Burris et al., 5 November 2026); Children’s Hospital of Philadelphia; Reuters; Contemporary Pediatrics.