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

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    William, Kate and baby leave hospital

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William, Kate and baby leave hospital

Watch as Prince William places his new son in a car seat and drives his family away from the hospital.

William, Kate and baby leave hospital

Watch as Prince William places his new son in a car seat and drives his family away from the hospital.