August Philip Hawke Brooksbank was born 11th on the throne.
Princess Eugenie’s young son will then advance to 12th place once the Duke and Duchess’ second child arrives.
August falls into the series of successors after Eugenie and before the Earl of Wessex.
Edward, who finished third when he was born in 1964, currently ranks 12th.
Until Baby Sussex arrives, the top 10 spots will remain unchanged – the Prince of Wales, the Duke of Cambridge, Prince George, Princess Charlotte, Prince Louis, the Duke of Sussex, Archie Mountbatten-Windsor, the Duke of York, Princess Beatrice and Eugenie .
With so many people on the throne before him, it is extremely unlikely that August will ever become monarch.
He will go through the succession list over the years when the children of Cambridge and Sussex have their own families in the future.
Monarchs rose to the throne from below on very occasional occasions.
King George I was 52nd in line, but in 1714 he was elected next Protestant over at least 50 of his Catholic relatives under the Settlement Act.
The son of Eugenie and Jack Brooksbank is not entitled to use an HRH style or to have a title.
His father has no title and he was born into a female line of the royal family, with rules enacted by King George V in 1917 restricting royal titles.
He is a regular Master Brooksbank.