Disney Channel will launch the third season of “Good Luck Charlie” with back-to-back episodes May 6.Interest in “Charlie” peaked when an original telepic based on the series, airing in December, drew 6.9 million viewers in its premiere. That episode revealed that the family in the show would be adding a new baby, who will be welcomed in the third season. Overall last year, “Charlie” was the No. 2 on television among viewers 6-11 and 9-14. Bridgit Mendler, Jason Dolley, Leigh-Allyn Baker, Bradley Steven Perry, Mia Talerico and Eric Allan Kramer star in the series, exec produced by Phil Baker, Drew Vaupen and Dan Staley for It’s a Laugh Prods.