ABC Family has picked up a fourth season of original drama series Switched at Birth. The third season finale of the Peabody Award-winning series airs next Monday. Switched at Birth was a breakout when it launched in 2011 and has done solid business since. It ranks as cable TV’s No. 1 series in its time period in key female demos. “Fans will be clamoring for season four and to know what happens with Daphne and Bay after the season three finale next week,” said Tom Ascheim, President ABC Family. Switched at Birth tells the story of two teenage girls who discover they were accidentally switched as newborns in the hospital. The series is executive-produced by Lizzy Weiss and Paul Stupin.