Display on BT Tower reading: "It's a boy"
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Royal baby news displayed on BT Tower

22 July 2013 Last updated at 21:48 BST

News of the birth of the Duke and Duchess of Cambridge's son has been displayed on London's BT Tower.

The baby was born at 16:24 BST, weighing 8lb 6oz, at St Mary's Hospital in Paddington, West London.