Check this out:
"Are Vitamin K Shots Necessary?
Randall Neustaedter, OMD, LAc, CCH
An injection of vitamin K (1.0 mg) is routinely administered to all newborns to prevent unexpected bleeding caused by low levels of vitamin K-dependent blood clotting factors. Vitamin K is present in green vegetables, vegetable oils, and dairy products, but intake or supplementation during pregnancy does not ensure prevention of vitamin K deficiency in newborns.
The syndrome of vitamin K deficiency bleeding occurs in approximately 1 in 10,000 babies. Hemorrhagic disease that occurs from week 2-12 of life is the most dangerous form. Half of these affected babies suffer sudden bleeding into the brain, and 20 percent of affected babies die. Studies have shown that a single injection or oral dose of vitamin K at birth results in adequate coagulation status and vitamin K levels for up to three months following birth.
Injected vitamin K ran into a problem when researchers in 1990 noted an increased incidence of childhood cancer in children given vitamin K injections at birth. Specifically, they found that injected vitamin K doubled the incidence of leukemia in children less than ten years of age. A subsequent study in 1992 revealed the same association between injected vitamin K and cancer, but no such association with oral vitamin K. These researchers recommended exclusive use of oral vitamin K.
Since vitamin K given within 12 hours of birth can reduce the risk of vitamin K deficiency bleeding, it seems prudent to give an oral dose of 1-2 mg. Injections of vitamin K are painful and can cause bruising at the injection site. There may also be an increased risk of cancer associated with vitamin K injections.http://www.cure-guide.com/Child_Heal...vitamin_k.html
Just wanted to add, that you should be able to request oral vit K in the hospital, should you decide to go that route. If you don't go with the vitamin K, you can supplement with alfalfa/chlorophyll starting from about 34 weeks prenatal to about 12 weeks postpartum. If you want I can send you links about that too.