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  23 July 2013 Last updated at 06:00 BST
  The baby was delivered at 16:24 BST at St Mary's Hospital in Paddington, west London, weighing 8lb 6oz.
  The duke is based at RAF Valley on Anglesey, north Wales, where he and his wife share a cottage.
  Flt Lt William Wales - who, as monarch, will one day be head of the armed forces - has spent recent years flying rescue missions, and qualified as a helicopter captain in 2012.
  Here is what his colleagues had to say to him.
  Wales welcomes 'joyous' royal birth
target: RAF crewmates of Prince William have sent their congratulations to him and the Duchess of Cambridge after the birth of their son.