Vitamin K injection at birth is a supplement recommended by American Academy of Pediatrics. Vitamin K can't be synthesized or absorbed by infants like it can in adults but plays a crucial role in blood clotting. Some parents have questions about providing a injected supplement to their hours old infant. This comprehensive review sums up the research and lists the risks and benefits of vitamin k injection, oral vitamin k, and foregoing the supplement.
http://evidencebasedbirth.com/evidence-for-the-vitamin-k-shot-in-newborns/
http://evidencebasedbirth.com/evidence-for-the-vitamin-k-shot-in-newborns/