In the hours after birth, newborns are typically given a shot of vitamin K, which they are naturally deficient of after they are born.
One shot of the vitamin is crucial for preventing vitamin K deficient bleeding (VKDB), a rare but deadly condition that causes bleeding in nearly every organ.
Research cited by the CDC shows infants who do not receive a vitamin K shot at birth are 81 times more likely to develop VKDB than those who get it, and about one in five babies with the condition die.
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Although it is not a vaccine, experts fear the vitamin K shot has been included in a nationwide wave of rising anti-vaccine sentiment and declining vaccination rates for once-eliminated illnesses like measles and polio.
Related on the SLP
Viewpoint: Vaccine deniers are attacking a life-saving Vitamin K shot for newborns that isn’t even a vaccine
More and more babies are developing uncontrollable bleeding—linked directly to vaccine deniers’ rejection of vitamin K shots
Challenging Kennedy—MAHA skepticism disinformation: No, the vaccine schedule is not a haphazard, scientific mess
In December, a national study of more than 5 million births was published in JAMA Network, which found that in 2024, 5.2 percent of babies born in the US had not received the vitamin K shot.
















