Vitamin K is needed for proper blood clotting, and a deficiency of this vitamin causes a syndrome called Vitamin K deficiency bleeding (VKDB). (kellymom.com)
So unrestricted breastfeeding in the first hour after birth, from a well nourished mother, serves as an immediate transfusion to newborns to assist with proper blood clotting. (ohbabynutrition.com)
In particular, they're a great source of vitamin K, which helps protect your arteries and promote proper blood clotting (2, 3). (healthline.com)