The Duchess of Cambridge is making fecundity fashionable again

There was a poignant bit of the Telegraph’s coverage of today’s happy event: “Everything we know so far after Duchess of Cambridge gives birth to boy”, it promised. Except that’s it. There is very little more to be said except perhaps the weight, 8lb 7oz – it’s at times like this we all revert to imperial measures – and the speed with which the Duchess left hospital, eight hours after the birth.