Catherine, Duchess of Cambridge holds her baby son while appearing with her husband, Britain's Prince William, outside the Lindo Wing of St Mary's Hospital in central London July 23, 2013. Prince William and his wife Kate gave the world its first glimpse of their new baby on Tuesday when they left hospital to a barrage of camera flashes with the boy who is third in line to the British throne. Picture taken July 23, 2013. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ROYALS ENTERTAINMENT HEALTH)