Britain's Duchess of Cambridge, who announced that she and her husband Prince William are expecting their first child together after Catherine was admitted to hospital for acute morning sickness, feels like the problem will "go on forever".
After Catherine's discharge on Thursday, William has joked about the misleading name of his wife's recent illness.
Speaking at the Winter Whites Gala in Earls Court, London, for homeless charity Centrepoint - which he is a patron of - William said: "I don't know why they call it morning sickness - they should call it all day and all night sickness. It's a long old process but she is getting there. She feels like it is going to go on forever."
The prince was to originally attend the event with Catherine - who was known as Kate Middleton prior to their nuptials - but the duchess has cancelled all her royal engagements leading up to Christmas and has been given strict instructions by staff at London's King Edward VII hospital to rest and stay hydrated.
Since the duchess left for Kensington Palace to rest, the hospital's nurse Jacintha Saldanha - who answered a hoax call regarding the duchess's state from Australian radio DJs pretending to be William's grandmother Queen Elizabeth and his father Prince Charles - has died in a suspected suicide and the royal couple have since expressed how "deeply saddened" they are at the tragedy.
A statement read: "The Duke and Duchess of Cambridge are deeply saddened to learn of the death of Jacintha Saldanha. Their Royal Highnesses were looked after so wonderfully well at all times by everybody at King Edward VII Hospital, and their thoughts and prayers are with Jacintha Saldanha's family, friends and colleagues at this very sad time."
Jacintha's husband Ben Barboza has shared how "devastated" he is at losing his wife, with who he has a 16-year-old son and 14-year-old daughter, posting on his Facebook page: "I am devastated with the tragic loss of my beloved wife Jacintha in tragic circumstances, She will be laid to rest in Shirva, India."
Mel Greig and Michael Christian, the DJs behind the hoax, are receiving counselling to help them cope with the severe backlash over the nurse's death.