Labor Lensby LlaMamma

Vitamin K at Birth

Newborns are born low in vitamin K, which the blood needs to clot. A single injection at birth virtually eliminates a rare but devastating bleeding disorder called VKDB (vitamin K deficiency bleeding).

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What it is

The AAP recommends a one-time intramuscular (IM) shot of 0.5–1 mg vitamin K within the first 6 hours after birth for all newborns. Without it, roughly 1 in 14,000 babies develops early or classic VKDB, and about 1 in 15,000–20,000 develops late VKDB (2 weeks – 6 months), which often presents as sudden brain bleeding. Oral vitamin K regimens are used in some countries but require multiple doses over months and are less effective at preventing late VKDB — the AAP does not currently recommend oral protocols in the U.S.

Evidence review links

Each link opens the full review on the publisher's site in a new tab.

Possible benefits

Possible risks

Alternatives

  • Oral vitamin K (multi-dose regimen) — available in some countries; less effective at preventing late VKDB and requires strict adherence[American Academy of Pediatrics↗]
  • Declining is legal in most places but significantly raises the risk of late VKDB and brain bleeding — the AAP considers refusal a form of medical neglect worth extra counseling[American Academy of Pediatrics↗]
Run BRAIN with Labor LensGet Benefits, Risks, Alternatives, Intuition, and Nothing/Wait for Vitamin K at Birth — plus questions for your care team.

Current evidence

AAP and CDC guidance is unanimous: a single IM dose within 6 hours of birth prevents VKDB. Rates of late VKDB rise 50–80 fold when parents decline. Oral regimens can work but require full adherence to 3+ doses over months.

Where the evidence is clear · where people may choose differently

For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.

Educational only. Your care team can help you weigh what applies to your specific situation.

Related evidence topics

Questions to ask your care team

  • ?Can the injection be given during skin-to-skin?
  • ?If we prefer oral, what regimen do you use and what's the evidence?
  • ?What signs of late VKDB should we watch for at home?
  • ?Can vitamin K be delayed briefly for immediate bonding?

Universal questions (works for any decision)

A short BRAIN-style set you can bring to any conversation about interventions, monitoring, or care decisions.

  • ?Why are you recommending this now — is it urgent, routine, or optional?
  • ?What happens if we wait an hour (or longer) before deciding?
  • ?What signs would tell us this is working — or that we need to change course?
  • ?What are the alternatives, including doing nothing?
  • ?What would you recommend if this were your family?
  • ?What would change your recommendation?

Sources & provenance

Tap a source to open the original guideline or review in a new tab.

Plain-language paraphrase. Re-verify before publish.

Last reviewed: 2026-07-03

Further reading — canonical references

Read the source material directly. Each link opens the publisher's own current guidance in a new tab — cross-check what we summarize against what they say.

Educational only. Guidelines evolve — the linked publisher pages will reflect newer guidance than any static snapshot.

Version history — v1.0.0

  • v1.0.0 · 2026-07-03 · LlaMamma editors

    Initial Vitamin K topic.

New guidance from ACOG, WHO, Evidence Based Birth, or other listed sources is recorded here and can be updated remotely without a new app release.