Vitamin K Deficiency and Associated Bleeding in Infants

This cross-sectional study examines changes in intramuscular vitamin K receipt and incidence of vitamin K deficiency and vitamin K–deficient bleeding among US infants between 2017 and 2025.

Corresponding Author: Elizabeth R. Wolf, MD, MPH, Department of Pediatrics, Virginia Commonwealth University, 1000 E Broad St, Richmond, VA 23219 (elizabeth.wolf@vcuhealth.org).

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