What vitamin supplement do breastfead babies and babies who drink less than 32 ounces of formula per day require?

While it is true that newborn babies can get almost all of their vitamins and nutrients from breast milk and baby formula, there is one specific vitamin that new mothers need to ensure that their babies get on a daily basis. It is the only vitamin that babies lack and which, unfortunately, cannot be received through breast milk alone or insufficient quantities of baby formula. So, which vitamin is it - vitamin B, vitamin C, vitamin D or vitamin K?

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