Why Prince Harry and Meghan Markle’s baby may not be called Royal Highness

Meghan Markle and Prince Harry‘s baby may not be called Royal Highness — thanks to his or her great-great-grandparent.

King George V introduced a rule in 1917 that means their baby will need special permission from the Queen to become an HRH.

Only the eldest son of the Queen’s first-born, Prince Charles, is entitled to be an HRH — no younger sons or daughters.

But in December 2012, before Prince William and Kate Middleton had their first child, Prince George, the Queen used the Letters Patent so she could give all of their children an HRH title.

The Letters Patent is a method that allows the sovereign to give orders without involving Parliament.

The Queen has yet to grant special permission for Harry and Meghan’s first child to be an HRH.

As it stands, a son will receive the title Duke — and if the Duke and Duchess of Sussex have a daughter next spring, she will not inherit any title.

It comes after circulating rumors claim Meghan will not have her baby where Kate had her three children.

The Duchess of Sussex is said to be eyeing the maternity unit at Frimley Park Hospital for the birth of her and Prince Harry’s first child.

The Duchess of Cambridge had Prince George, 5, Princess Charlotte, 3, and 8-month-old Prince Louis at the Lindo Wing of St Mary’s Hospital in Paddington, West London.

A royal source told the Daily Mail: “If their Royal Highnesses have moved to Frogmore Cottage before the birth, as planned, Frimley Park may be a more easily accessible option than St Mary’s.”

Meghan, 37, and Prince Harry, 34, are already planning to pull up stakes from their residence in Kensington Palace in West London for Frogmore in Berkshire.

The home on the Windsor Estate — which is being refurbished ahead of the move — sits 15 miles from Frimley Park.