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The Duke and Duchess have had a baby girl this week – but will Princess Charlotte really bring £1 billion to the British economy? Many of the newspapers having been making financial claims about how much the new baby will contribute to GDP. We look at where these numbers come from and judge how realistic they are. Plus – how useful are statistics about sex? Author and statistician Sir David Spiegelhalter explains when you should and shouldn’t trust bedroom-related figures. (Image: Mugs celebrating the birth of Princess Charlotte. Credit: AFP/Getty Images)