Lace at Finding the Truth has an interesting breakdown of the Vitamin k shot given at birth. Apparently there is a potential link to Leukemia.
Apparently one of the ingredients in the shot is Sodium hydroxide or "Lye". Drain cleaner in baby shots. Nice.
She notes that there is some safer alternatives, oral Vitamin K9 given at a much lower dose over 5 weeks. Also a nursing mom's Vitamin K supplementation of vitamin K will pass through the breast milk to the baby. And apparently formula has plenty.