The new royal baby boy has created history and will slot in as fifth-in-line to the throne.
Prince William and his wife Kate's third child means the new line of succession will see the new Prince of Cambridge follow the Prince of Wales, Duke of Cambridge, Prince George and Princess Charlotte.
Historically, Princess Charlotte would have lost her spot to her younger brother, but legislation introduced in 2013 overhauled the order of succession.
The newborn has also pushed Prince Andrew down to seventh-in-line, meaning he will not have to ask his mother's permission if he wanted to re-marry.