Vitamin K1 (plant based sources) does not cross the placenta well, but K2 (animal based sources) does. It is K2 that we really need to ensure we're getting a lot of.
ETA: Thanks for raising this question because re-reading back over the posts I referred to I'm not as convinced. It appears K2 crosses the placenta well... but it's actually K1 which is needed for clotting. So I'm not sure at this point how we can naturally ensure our babies have high levels of K1. More reading...
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