I'm a banshee, do I need it?
If you're a banshee who's prone to bruising easily, like Johnna or when pregnant (...) you might be in need of more Vitamin K. But be careful not to take too much Vitamin K in the last stages of pregnancy Johnna, since it could be toxic for the baby.

Newborn babies that are exclusively breast-fed are at increased risk of vitamin K deficiency for the following reasons: 1) human milk is relatively low in vitamin K compared to formula, 2) the newborn's intestines are not yet colonized with bacteria that synthesize menaquinones, and 3) the vitamin K cycle may not be fully functional in newborns, especially premature infants. Infants whose mothers are on anticonvulsant medication to prevent seizures are also at risk of vitamin K deficiency. Vitamin K deficiency in newborns may result in a bleeding disorder called vitamin K deficiency bleeding (VKDB) of the newborn. Because VKDB is life threatening and easily prevented, the American Academy of Pediatrics and a number of similar international organizations recommend that an injection of phylloquinone (vitamin K1) be administered to all newborns.