Queen Elizabeth II made an exception for Kate Middleton but not for Meghan Markle.

The royal family welcomed Prince Harry and Markle’s son Archie in May. However, unlike Prince William and Middleton’s children, the tot does not have a royal title.

In 1917, the Queen’s grandfather King George V issued a Letters Patent that limited the use of royal titles to only the children and grandchildren of the sovereign (in the male line) and the eldest son of the eldest son of the heir.

Under the ruling, only male great-grandchildren of Queen Elizabeth II would be called prince and princess and referred to as His or Her Royal Highness (HRH). Based on the ruling, Prince George will receive the title, but not his siblings Princess Charlotte and Prince Louis.

However, Queen Elizabeth II issued a decree in 2013 granting the title to all the children of the Duke and Duchess of Cambridge, an exception she made for Middleton but not Markle, Express reported. If the Queen did the same to the children of the Duke and Duchess of Sussex, Archie would also have an HRH title.

Although Markle’s son doesn’t have a title, he is entitled to receive one when Prince Charles takes over the throne.

“Archie will be able to use the title of HRH Prince when Charles becomes King,” royal historian Carolyn Harris said.

“But it is possible that he will not use this title. Archie will not be able to pass the title of Prince or Princess to his children as they will be another generation removed from the sovereign, but the title of Duke of Sussex will pass to Prince Harry's male line descendants.”

Also, as Prince Harry’s first-born son, Archie will receive the title Earl of Dumbarton, one of the Duke of Sussex’s subsidiary titles. However, Prince Harry and Markle opted to not bestow this upon him, for they are keen on giving him a normal life as much as possible.

Meanwhile, Prince Harry and Markle have been slammed by the public following their decision to keep Archie’s baptism private. In a poll, 82 percent of the respondents said that it was a wrong move because they were public figures. They can live private lives if they stick to private funding, one respondent said

kate queen and meghan
On the left, Britain's Queen Elizabeth II and Catherine, Duchess of Cambridge attend the Remembrance Sunday ceremony in central London, on Nov. 11, 2018. On the right, Meghan, Duchess of Sussex visits the Hubb Community Kitchen on Nov. 21, 2018 in London. Tolga Akmen/Jack Taylor/AFP/Getty Images