Between February and September, four babies in Nashville, Tenn., were diagnosed with late vitamin K deficiency bleeding, CDC officials said. All were healthy until 6 to 15 weeks of age, when three had intracranial hemorrhage and one experienced gastrointestinal bleeding. A vitamin K injection at birth has been standard protocol in the U.S. since 1961, but parents of the babies declined the vitamin K shot for various reasons, such as concerns about possible increased leukemia risk and the belief that the injection was unnecessary.

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