Vitamin K at birth: when should parents decide?

It is best settled around the birth.

Vitamin K at birth

Q: Vitamin K at birth: what are the options?

There are 3 main approaches: Intramuscular shot within 6 hours of birth; Oral regimen (three doses over about 8 weeks); Decline.

Q: Vitamin K at birth: what does the evidence say?

Well established. Guidance and evidence agree. The real question is whether you'll follow it. AAP and CPS both recommend a single intramuscular dose within 6 hours of birth (1 mg for babies over 1,500 g). Where parents decline, CPS gives an oral alternative of 2 mg at the first feeding, repeated at 2-4 and 6-8 weeks, but says injection is substantially more effective at preventing late bleeding; a 1993 review dispelled the old concern about childhood cancer; the AAP reports refusals rising along with late-onset bleeding

Whether your newborn gets vitamin K, which helps blood clot, and in what form. It is usually offered as a single shot in the first hours of life.

Should our newborn get the vitamin K shot?

In short: Parents choose between 3 main approaches: Intramuscular shot within 6 hours of birth; Oral regimen (three doses over about 8 weeks); Decline. Evidence: well established. Guidance and evidence agree. The real question is whether you'll follow it. Best settled: around the birth.

Evidence: Well established
Best settled: Around the birth
Part of: Pregnancy to first birthday

Vitamin K at birth: what are the options?

Parents usually land on one of these 3 approaches.

1. Intramuscular shot within 6 hours of birth
The baby gets a single vitamin K injection in the thigh soon after birth.
2. Oral regimen (three doses over about 8 weeks)
The baby gets vitamin K by mouth in several doses over the first weeks.
3. Decline
The baby does not get vitamin K.

Vitamin K at birth: what does the evidence say?

Well established. Guidance and evidence agree. The real question is whether you'll follow it.

AAP and CPS both recommend a single intramuscular dose within 6 hours of birth (1 mg for babies over 1,500 g). Where parents decline, CPS gives an oral alternative of 2 mg at the first feeding, repeated at 2-4 and 6-8 weeks, but says injection is substantially more effective at preventing late bleeding; a 1993 review dispelled the old concern about childhood cancer; the AAP reports refusals rising along with late-onset bleeding

Sources

What else is worth knowing?

Newborns have very little vitamin K, which blood needs to clot. A single injection at birth is the standard way to prevent a rare but serious bleeding problem in the first months. An oral course exists and is considered less reliable.

Questions to ask each other

What do we know about vitamin K, and what questions do we have for our provider?
Are there any worries we want to talk through before the birth?
Who will make sure our choice is written down for the delivery team?

More in Newborn medical choices

First published 2026-10-03. Last updated 2026-10-05. General information, not medical advice.