Fake vitamins are junk, IMO. They inhibit the absorbtion of real ones, not to mention constipation etc. I eat a real, wholesome balanced diet and that is all any of us needs in a normal situation.
All babies are born with a low ability to clot their blood. If there is a birth trauma such as forceps, vacuum extraction, serious bruising or if you intend to circumcise, you should consider this shot.
Otherwise it's garbage.