Vitamin K for Newborns: What Every Parent Should Know

Vitamin K is an important part of newborn care, yet not every family understands why it is recommended after birth. Meghan Martin, M.D., a pediatric emergency medicine physician at Johns Hopkins All Children’s Hospital, explains why the vitamin K shot — which is not a vaccine — plays a critical role in helping newborns’ blood clot properly and in preventing dangerous bleeding, including brain bleeding. She also shares why clear, accurate information is so important for parents making decisions for their babies.

Q: What’s driving some parents to decline the vitamin K shot, and how much of that is influenced by misinformation?

A: There are a few reasons. Some parents are worried about side effects, some prefer a more “natural” approach and some have heard misinformation online. Unfortunately, a lot of the concerns are based on myths rather than evidence. A significant amount of this issue is tied to social media and misinformation, which can spread medical myths very quickly.

Those messages are often emotional and persuasive, but they don’t always reflect the science. I think many parents are trying to do what’s best for their child, but they’re being influenced by inaccurate information.

Q: If a baby doesn’t receive vitamin K after birth, how fast can vitamin K deficiency bleeding appear?

A: I’ve become increasingly concerned because I’ve seen more families declining vitamin K, and with that, more babies coming in with bleeding problems. It’s a preventable condition, which makes each case especially heartbreaking. It can happen very quickly, or it can be delayed. That’s part of the danger.

Parents may think their baby is healthy because everything seems fine for days or even weeks, but vitamin K deficiency bleeding can still show up later and suddenly become an emergency.

Q: Why is brain bleeding in newborns so dangerous, and what signs should parents watch for?

A: It can happen suddenly and be very serious. A baby may look fine at first, and then symptoms can appear when the bleeding has already progressed.

Common warning signs include poor feeding, unusual sleepiness, vomiting, fussiness, bruising, pale skin, abnormal movements and/or seizures. Sometimes the bleeding is already severe by the time the baby is brought in, which is why this is so alarming.

Q: What happens when these babies arrive in the emergency department, and what are the outcomes?

A: They often need urgent evaluation, including imaging and blood tests, and some require admission to the pediatric intensive care unit. If there’s brain bleeding, the care can become very complex very quickly. The goal is to stabilize the baby and prevent further injury, but sometimes the damage is already significant.

Outcomes depend on how much bleeding there is and how quickly treatment begins. Some babies recover, but others suffer long-term complications such as permanent neurologic injury and developmental problems. The most severe cases can be fatal. That’s why prevention is so important.

Q: What are those conversations like with parents after a traumatic diagnosis like this?

A: Many are shocked and scared. Often, they had no idea that refusing vitamin K could lead to something this serious, and many times there is a lot of regret once they understand the connection between the refusal and the bleeding. These are incredibly difficult conversations because nobody wants to hear that their newborn is critically ill from something that could have been prevented.

Yes, some families think the shot is optional because the baby seems healthy, and that’s understandable from a parent’s perspective, but that’s also part of the problem. Babies can look perfectly healthy and still be at risk. The vitamin K shot is not treating a current illness — it’s preventing a dangerous one from developing later.

Q: Is this something you’re seeing more often in birthing centers or midwife settings, and what would you say to parents who are unsure?

A: Sometimes, yes. Families delivering outside a hospital or in settings where they feel more comfortable declining interventions may be more likely to refuse the shot. But this can happen in any birth setting. What matters most is that parents receive accurate, evidence-based counseling before making the decision.

For parents who are unsure, I would encourage them to talk with their pediatrician or birth provider and ask questions from trusted medical sources. The vitamin K shot has been used for decades and is one of the best ways we have to prevent a rare but life-threatening bleeding disorder in newborns. It’s a simple intervention with enormous benefits.

Q: What do you hope more people understand about this issue?

A: I wish people understood that this is not a theoretical risk. I’ve seen the consequences firsthand in the emergency department. This isn’t about fearmongering — it’s about preventing real, serious harm. The vitamin K shot is a safe, routine measure that can protect babies from brain bleeding and other life-threatening hemorrhages.

To read more about pediatric healthcare news, visit HopkinsAllChildrens.org/newsroom.

Presented By*: John Hopkins All Children's Hospital