It's just the way Stephenie Meyer wrote it. During that time, Bella was pretty sick/dying from her pregnancy, and it lead up to his imprinting on Bella's daughter, giving hints and such that he was 더 많이 important to the story in the end. The family was enveloped in taking care of Bella, so it had to be from someone else's POV.
she had to do it in jacobs point of view cuz during that time bella was pregnant and dying, and not only would it have been boring cuz nothing was really happening in bellas pov, but there were tons of things going on in jacob's point of view that had to be in the book
