here is a big twilight spoiler for the forth book breaking dawn. in breaking dawn edwasrd and bella get married and on their honey moon bella gets pregnant even thought edward is a vampire and since edwards a vampire and bella is a humen the baby is half of each.so when te baby is inside of bella it drinks her blood because thats what vampires live off of so bella starts to die and edward can not stand for er to die so when the baby is born edward bites bella for her to live and bella turns into a vampire for a more desriptive story read it all by stephanie meyer!