Did you know that the couple's first child won't automatically become a prince or princess?
Because of the rules set out by King George V in 1917, Harry and Meghan’s first child won't automatically become a prince or princess.
The rules mean only the oldest grandson of the heir apparent is styled prince.
The Queen made a special exception for all of Prince William and Kate’s children. Prince George, Princess Charlotte and Prince Louis all have the title.
The Queen would have to give permission to the Duke and Duchess of Sussex too. Otherwise their child will become Lord or Lady of Mountbatten-Windsor.
They may even choose to turn down the styling of their baby if it is offered, as not having a royal title would mean opportunities to pursue a more normal life.
Some are predicting a royal birth in February.