Olympian Kerri Walsh Jennings is now a proud mother of three, and she or he’s still desirous about profitable that next gold medal.The three-time seaside volleyball Olympic gold medalist and her husband, Casey Jennings, welcomed Scout Margery Jennings on Saturday morning. Scout weighed in at 7 pounds, 2.6 oz. and stretched 20 1/4 inches lengthy.Little Scout made her TODAY debut on Tuesday, cradled within the fingers o…