If Edward Cullen is dead and doesn't produce sperm how can him and Bella have a baby?

"The normal reactions of arousal are still present in vampires, made possible by venom-related fluids that cause tissues to react similarly as they do to an influx of blood. Like with vampire skin-which looks similar to human skin and has the same basic function-fluids closely related to seminal fluids still exist in male vampires, which carry genetic information and are capable of bonding with a human ovum." - Stephenie Meyer