How Could a Vampire Have a child if they r die?

You might want to read the following artigo that discusses Stephenie Meyer's Vampire Mythology

"In relation to this same issue, why is it that only male vampiros can reproduce, while female vampiros cannot? Or could it be that it’s possible for a human male to impregnate a female vampire?"

link

Male vamps and male humans stay the same from puberty to death,while females have to go through process of fertile eggs. Thats my answer i geuss!!