How Archie will become a prince
Prince Harry and Meghan's baby Archie Harrison was welcomed into the world this week and does not have a royal title from birth like his cousins.
But he will become a prince when his grandfather Prince Charles is King, it has been reported.
The Sun reports that Archie was born on Monday morning and was revealed yesterday by his parents, who have chosen to not give him a curtesy title.
As he is the first born son of a duke, he could have become Earl of Dumbarton - which was one of Harry's subsidiary titles - or Lord Archie Mountbatten-Windsor.
Instead, he will be now known as Master Archie Mountbatten-Windsor, which is a signal the couple want their child to be a "private citizen".
But it is now understood the Duke and Duchess of Sussex's son will get a His Royal Highness title when Charles is on the throne and become a prince, if his parents wish.
A source told the Evening Standard: "The Sussexes have chosen not to give their children courtesy titles at this time, however, on the change of reign the George V convention would apply."
The George V convention is a royal decree made a 100 years ago by the Queen's grandad George V in 1917, which means the grandkids of a reigning monarch through the male line get a HRH title.
This decree means Eugenie and Beatrice have princess titles, thanks to their dad Prince Andrew.
Yet it is unclear if Meghan and Harry have the power to revoke this title when it will be applied to their son Archie.
You'll notice that Prince Edward's kids, Louise and James, don't have prince or princess titles, and this is due to the Queen making an exception to the 1917 ruling.
She announced that their children would be styled as the children of an earl, rather than as prince or princess, and they are now known as Lady Louise Windsor and James, Viscount Severn.
The Queen also revoked the decree to offer titles to her grandkids from a female line, Princess Anne, but they refused for their kids, Zara and Peter.
Usually the HRH status lapses after two royal generations - but the only exception to the rule is the eldest son of the eldest son of the eldest son of the monarch, which is Prince George, who automatically gets a title.
However, the Queen issued new Letters Patents in 2012 enabling all of Prince William and Kate's children to have HRH titles, which is why Charlotte and Louis have them too.
For Archie to have been made a prince at birth, the Queen would have had to issue Letters Patent immediately.
The Evening Standard reported that Meghan and Harry are happy for Archie to take his title in due course and have "decided to keep things simple for now."
Buckingham Palace told the publication: "While there are courtesy titles that Their Royal Highnesses The Duke and Duchess of Sussex could apply to their son, they have chosen not to give him a courtesy title at this time.
"So he will be known as Archie Harrison Mountbatten-Windsor."
When Prince Charles takes the throne, all grandkids will automatically gain HRH status.
This article originally appeared in The Sun and is republished here with permission