1. William and Kate DON'T know if it's a boy or girl
Despite plenty of speculation that the Duchess had accidentally revealed it was a girl.
2. The betting public think the royal baby will be a girl called Alexandra
According to Ladbrokes, a female royal baby is currently odds on at 2/5 while a boy is at 2/1.
At 4/1, Alexandra is the name favoured by punters ahead of Elizabeth (5/1) and Diana (6/1).
3. The birth will be announced on an easel
4. The royal baby will be the country's 43rd King or Queen of England*
*Since the Norman Conquest
5. The doctor overseeing the pregnancy is the former fiance of Jill Dando
Alan Farthing was engaged to TV presenter Jill Dando when she was shot and killed in 1999.
6. If they're paying, The Duke and Duchess' stay at their hospital could cost £12,000
A normal delivery package at the Lindo Wing including a one-night stay costs £4,965, with an extra night in a deluxe room costing £1,050, plus consultant's fees which can come to around £6,000, depending on the care required, meaning a two-night stay can cost more than £12,000.
7. Royals could be sipping complementary bubbly after the baby is born
The wing also offers a "comprehensive wine list should you wish to enjoy a glass of champagne and toast your baby's arrival".
8. William could be flying a helicopter when Kate goes into labour
William will take paternity leave from his job as an RAF search and rescue helicopter pilot - thought to be two weeks - but could well be in the skies if Kate goes into labour early.
9. The royal baby pushes Prince Harry down to fourth in line to the throne
Prince Harry falls behind the royal baby, Prince William and Prince Charles in order of succession, regardless of the gender of Kate's child.