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From baby fashion to specially-minted coins, here is an A to Z on the birth of Prince William and his wife Kate's second child, as the Duke and Duchess of Cambridge prepare for their new addition to Britain's royal family. A proclamation will be displayed on an easel at the gates of Buckingham Palace, while news of the birth will be tweeted by Kensington Palace and emailed to the press. The new royal baby will be 21 months younger than older brother Prince George, who is directly in line to become king one day. Tradition dictates the Archbishop of Canterbury Justin Welby, England's highest cleric, will conduct the christening.