supposedly, every baby needs a Hep B shot on the day they are born,

because MAYBE their mother MIGHT have Hep B,

and somehow the Hep B test they give the mother MIGHT be a false negative,

and so the mother actually has Hep B, BUT the Hep B test didn't catch it.

and so the mother has Hep B, but the test can't find it, AND somehow the mother is NOT already giving Hep B to the baby while the baby is still inside the mother, because the blood is separate,

BUT during childbirth, the mother BLEEDS her Hep B infected blood all over the baby, thus exposing the baby to Hep B

But thanks to the marvels of Rockefeller Medicine,

your baby can now get a Hep B shot, that will somehow train your babies immune system how to fight the imminent Hep B infection that will certainly follow, before the Hep B infection itself takes hold.

Oh, and babies are also known to engage in highly risky behaviors, such as sharing dirty drug needles with sketchy prostitutes.

They need it because those longnose doctors see a bleeding baby penis and they just can't help themselves.