The thing about the baby and vampire spell is (in fine esprit d'escalier) that the spells were aught more than a wishlist for the attributes you wanted, and the casters were utterly unimaginative and short-sighted.
So if I was casting magic to become a baby vampire, why would I want to be weak to "vervian" and sunlight? Why not cast the "Spell to become a vampire better than all those other vampires spell"? Why not go the whole hog and cast "Spell to become like unto a god spell"?
Hell, that's easy: "I want to be utterly awesome in all regards, with physical attributes superior to those of all other men, eyes whatever colour my whims fancy, and with no flagging self-esteem issues."
I'm such an expert at this shit!