The scenes involving the baby Renesmee in "The Twilight Saga: Breaking Dawn Part 2" featured a CG infant that seemed slightly creepy rather than otherworldly.
However, it was a massive improvement over what they had on set. Producers originally had commissioned an animatronic baby for use in scenes, but its appearance was so unsettling that director Bill Condon cut it from the picture.
It was odd enough that it was dubbed 'Chuckesmee', referring to the Chucky doll from the "Child's Play" films. In an interview last year, Condon called the doll: "A giant misfire on all fronts. Truly, it was one of the most grotesque things I've ever seen... There was one shot where I call, ‘Cut!' and suddenly she turns her head and mechanically stares right into the camera. It was incredibly disturbing."
Now, an amusing featurette just released in the new "Twilight Forever" box set showcases the animatronic doll in all its unsettling glory.
Source: Bad Ass Digest