LONDON, UNITED KINGDOM - JULY 23:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with their newborn son speak to the media before departing the Lindo Wing of St Mary's Hospital on July 23, 2013 in London, England. Catherine, Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William, Duke of Cambridge at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge.(Photo by John Phillips/UK Press via Getty Images)