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

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

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

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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!!