The Duke and Duchess of Cambridge are expecting a baby, St James’s Palace announced yesterday.

Months of speculation about a Royal pregnancy were ended yesterday afternoon when William and Kate told the world they will be parents for the first time.

But the announcement also revealed the Duchess is being treated for very acute morning sickness – hyperemesis gravidarum – at a private London hospital.

The Duke was by her side after she was admitted to the King Edward VII Hospital by car earlier yesterday. She is expected to remain for a few days.