LONDON, UNITED KINGDOM - JULY 23: Prince William, Duke of Cambridge carries his newborn son in a car seat before departing with Catherine, Duchess of Cambridge by car from 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)