New royal baby fifth in line to the throne

The Duke and Duchess of Cambridge's third child will become fifth in line to the British throne, but his sister remains fourth.

The Duke and Duchess of Cambridge's third child becomes the fifth in line to the British throne. (AAP)

THE BRITISH ROYAL FAMILY'S LINE OF SUCCESSION

* Prince Charles, The Prince of Wales

* Prince William, The Duke of Cambridge

* Prince George of Cambridge

* Princess Charlotte of Cambridge

* Baby Cambridge number three

* Prince Henry (Harry) of Wales

* Prince Andrew, The Duke of York

* Princess Beatrice of York

* Princess Eugenie of York

* Prince Edward, The Earl of Wessex

* James, Viscount Severn

* The Lady Louise Mountbatten-Windsor

* The Princess Royal, Princess Anne

* Peter Phillips

* Savannah Phillips

* Isla Phillips

* Zara Tindall

* Mia Tindall