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Skipping Newborn Vitamin K Shot Linked to 47% Higher Bleeding Risk: What Parents Need to Know

Guides · November 5, 2026 · 2 min read · By AnbuBaby

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Deep Dive: Skipping Newborn Vitamin K Shot Linked to 47% Higher Bleeding Risk

Parenting · 5 November 2026 · Deep dive

A large JAMA study of more than 5.2 million U.S. infants finds that newborns who did not receive the routine intramuscular vitamin K shot had a 47% higher risk of bleeding by six months of age. Nonreceipt more than doubled from 3.1% in 2017 to 6.8% in 2025. Intracranial bleeding risk more than doubled.

Background Vitamin K is essential for blood clotting. Babies are born with low stores. The intramuscular dose has been standard for decades and is recommended by the AAP and CDC.

What changed CHOP analysis of Epic Cosmos data (5.24 million infants):

Any bleeding by 6 months: 288 vs 186 per 10,000 (ARR 1.47)
Intracranial bleeding: 33 vs 13 per 10,000 (ARR 2.43)
Death with concurrent bleeding at birth hospitalization: 2.9 vs 1.1 per 10,000 (ARR 2.69)

Number needed to harm ≈ 114.

Competing viewpoints Medical consensus supports the shot. Some parents prefer oral vitamin K or decline due to needle concerns. Study is observational with adjustments for confounders.

What to watch next Updated counseling scripts, continued nonreceipt trends, any guidance updates.

Parents can ask for absolute risks and hospital protocol. Evidence favors the standard IM dose.

Sources: JAMA Burris et al. 5 Nov 2026, Contemporary Pediatrics, CHOP.

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