Per the article: "All newborns lack vitamin K. No matter how much vitamin K a mother consumes, it doesn’t sufficiently pass through the placenta, and breast milk contains only small amounts." Even vitamin fortified formula may not be enough to provide infants with enough vitamin K to prevent bleeding. The open question in the medical community is not which newborns lack vitamin K (they all do), but why some vitamin K deficient newborns develop bleeding while others don't.

I guess I don't see the point in rejecting the shot. It's a vitamin, it has a clear benefit, and no drawback.