What will the New Royal Baby's Title be?
Understanding royal titles can be tricky because royals can hold more than one - especially after they're married.
Since we don’t know the gender of the new baby yet, there are two title options.
If Kate and Wills’ new addition is a boy, his formal title would be, His Royal Highness Prince (Name) of the United Kingdom of Great Britain and Northern Ireland.
If it's a girl, her formal title would be, Her Royal Highness Princess (Name) of the United Kingdom of Great Britain and Northern Ireland.
This will be the baby’s official title – but he or she will have others.
Historian Marlene Koenig told Town & Country that royal children's titles are styled differently if they are also the children of a duke.
This means that because the new baby’s parents are the Duke and Duchess of Cambridge, they will also have the title of His or Her Highness (Name) of Cambridge.
Why will the baby be born a commoner?
It does get more confusing.
Marlene also said that the new royal will technically be born a commoner.
She added: "It sounds complicated, but in the UK, the only people who are not commoners are the Sovereign and peers of the realm, [people with titles like] Duke, Marquess, Earl, Viscount, and Baron.”
This means Prince Harry is technically a commoner too - until he marries Meghan Markle in May.
The Queen then has the option to grant Harry and Meghan new titles after they are wed.