This is an excerpt of PopSugar‘s interview with Melissa Rosenberg
PS: We’ve heard there are some scenes you want to avoid showing on screen in Breaking Dawn. For example, Bella giving birth. Can you tell us why?
MR: That was a misquote. The childbirth — all the scenes, I feel — should be on screen. I think perhaps what I was referring to was, would we actually see Edward’s teeth through the placenta? I don’t think so. I don’t think we need to see that, and if someone needs to see that, I think they should take a look at that. [Laughs.] I believe it will be implied, but I don’t think we’ll see teeth in the placenta.
Source : Robstenation