Official announcement of the Royal Court:
Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child.
The Queen and members of both families are delighted with the news.
As with her first pregnancy, The Duchess is suffering from Hyperemesis Gravidarum. [...]
The Duchess of Cambridge is being treated by doctors at Kensington Palace.
The pregnancy had to be announced earlier than the usual 12-week-mark due to the fact she has treatment against HG again, as with her first pregnancy.
It is not sure yet whether she's going on her first solo trip to Malta as announced some weeks earlier.