> Twilight Breaking Dawn: Jacob warns the Cullens in new video clip
> Twilight Breaking Dawn: Bella, Edward say wedding vows - watch now
Bella (Kristen Stewart) is seen going into labour in the 30-second clip, which also features the baby's father Edward (Robert Pattinson) researching Dhampirs - children of a vampire father and a human mother.
"It's too strong and fast-growing. Your heart will give out before you can deliver," says Carlisle Cullen (Peter Facinelli) of the unborn baby, while Edward warns that it's "crushing you from the inside-out".
The Twilight Saga: Breaking Dawn - Part 1 is released in cinemas worldwide on November 18, followed by Breaking Dawn - Part 2 on November 16, 2012.
> Twilight Breaking Dawn: Watch new Jacob, Love Forever TV spot videos
> Twilight's Bella makes shock discovery in new Breaking Dawn video