Prince William's vehicle outside the hospital
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Royal baby: William leaves Kate hospital

3 December 2012 Last updated at 22:00 GMT

The Duke of Cambridge has left the hospital in London where his wife was admitted earlier, suffering from acute morning sickness.

St James's Palace announced that the duchess is pregnant at the same time as announcing that she would be in hospital for several days.

Philippa Thomas reports from King Edward VII hospital in central London.