JAMA Pediatrics Study Links Rising Vitamin K Refusal to Increased VKD and VKDB in Over 11 Million US Infants

{"Researchers at Virginia Commonwealth University used a national deidentified EHR database to track infants at 35 weeks gestation or later. They measured receipt of intramuscular vitamin K at birth against subsequent diagnoses of vitamin K deficiency and vitamin K-deficient bleeding through six months of age. Absolute increases in bleeding events remained small but scaled across millions of births, with intracranial hemorrhage documented in 7% of VKD cases and 2% of VKDB cases.","The study period overlapped with documented growth in parental refusal, rising from roughly 2.9% to 5.2% in earlier reports. Behaviors known to elevate VKD risk, such as exclusive breastfeeding without supplementation or malabsorption disorders, did not increase during the same interval. This pattern supports an association between declining prophylaxis and higher deficiency rates, though the design cannot establish direct causation.","Contextual factors include growing mistrust in routine newborn interventions, paralleling patterns seen with other perinatal recommendations. Late-onset VKDB carries a 30-60% risk of intracranial hemorrhage, underscoring why even modest uptake drops can produce measurable harm. Messaging that treats the shot as optional has contributed to parental unawareness of these specific risks.","Next steps require targeted studies testing communication strategies that convey absolute risks without overstating them. Surveillance through 2028 should track whether refusal exceeds 7% and whether VKDB incidence correspondingly surpasses prior baselines in the same database."}