Attention: a series of spoilers about the quarter of the Twilight Saga, that is, Dawn. According Wyck Godfrey comments, Producer of the film adaptation of Stephenie Meyer's Fourth Book:
In the film Amanecer Edward Cullen and Bella Swan get married and spend their honeymoon on the island “Esme” in Brazil. It is then that Bella becomes pregnant and the baby grows rapidly, putting her life in danger.
The newlyweds, Edward Cullen and Bella, return to Forks where she gives birth to an immortal baby, half vampire and half human whom they call Renesmee in honor of Esme, mother of Edward Cullen and Renée, mother of Bella.
Renesmee grows rapidly and since she is a few days old she is able to speak as well as transmit her thoughts to others when she touches them. At the end of the book Renesmee is able to highlight things that are impossible for children her age and –of course- normal.
In addition, something logical considering the pull that this saga has, is considering dividing the story of the book Breaking Dawn into two different films. Why? Logically to get more slice at the box office with this love between a vampire and an adolescent human.