Board Thread:Art, Stories and Songs/@comment-26186871-20151123001419/@comment-25588272-20151123173609

No. That's not what happened. They changed the animatronics' jaw.

Compare Fredbear singing to Freddy singing in FNaF1. Fredbear's mouth moves straight up and down, making it much easier to bite a kid than with a human-like jaw mechanism.