Diet/ gut germs: Vitamins are something we need we can't make ourselves & for vitamin k there is a special step. Intestinal bacteria help convert ingested k precursors to the active form we need. Since newborns have no gut germs at the start, it takes a while to start the process. That is why babies get a v k shot at birth to bridge the ~ 8 days it takes for the process to kick in.
Answered 12/28/2012
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