Kensington Palace said in a short statement: “Their Royal Highnesses The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in April 2015.
“The Duchess of Cambridge continues to be affected by hyperemesis gravidarum, but her condition is steadily improving.”
Confirmation of the expected birth month suggests Kate has had her 12-week scan and seen images of the baby for the first time.
With the Duchess just over 12 weeks pregnant, it is likely that the baby is due around the end of April and could possibly arrive on William and Kate’s fourth wedding anniversary on April 29.
The prince or princess will be born as the nation gears up for the General Election in May. If the baby is born late, it could even arrive on election day.
There has already been speculation that the baby’s birth could coincide with the 89th birthday of its great-grandmother the Queen on April 21. Other notable royal anniversaries in April include the Prince of Wales and the Duchess of Cornwall’s 10th wedding anniversary on April 9.