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Britain’s Catherine, Duchess of Cambridge, holds her baby son outside the Lindo Wing of St Mary’s Hospital before leaving with Prince William, in central London July 23, 2013 (Credit: Reuters/John Stillwell)

Britain's Catherine, Duchess of Cambridge, holds her baby son outside the Lindo Wing of St Mary's Hospital before leaving with Prince William, in central London July 23, 2013 (Credit: Reuters/John Stillwell)