[UncleMeat]

Vitamin K is needed for clot formation. Babies are born with a Vitamin K deficiency. This makes any bleeding much more likely to be fatal.

[i_think_so]

If your newborn is bleeding there is something wrong and you need to address it.

See my longer comment above regarding this vitamin deficiency, why shots should not be the first response, and hints at why we have this status quo.

[brendoelfrendo]

If your newborn is bleeding in their brain, you may not realize something is wrong until there are irreversible consequences. Preventative supplementation with vitamin K seems to be the best thing you can do to address it before it happens.