However, the three-year-old is still above his uncle, Prince Harry, who is 36, in the line to the throne.
In the past, the traditional royal rule – called male-preference primogeniture – favored male children as heirs to the throne, even if they had an older sister.
This is why Princess Anne is further from being Queen than her younger brothers Prince Michael and scandal-prone Prince Andrew are not becoming king.
But a 2013 ruling by the Queen meant that this traditional rule, which some might consider sexist, has been scrapped.
Now age comes before sex – a change that was hailed at the time as fairer for royal women and more in line with modern opinion about the role of men and women in society.
When Prince Louis, the third child and youngest son of the Duke and Duchess of Cambridge, was born in April 2018, he became the first royal to be affected by this change.
This places the fifth three-year-old on the throne, below his older sister Charlotte, who is six.
However, the line of succession still gives surprising results.
William and Kate’s three children, George, 7, Charlotte and Louis, precede Prince Harry, the queen’s grandson and son of the heir to the throne.
The first in line remains Prince Charles, followed by his eldest son William, Duke of Cambridge.
The order of succession
- Prince charles
- Prince William
- Prince George
- Princess charlotte
- Prince louis
- Prince harry
- Archie Mountbatten-Windsor
- New Baby Sussex – expected to arrive soon
- Prince Andrew
- Princess Beatrice
- New baby Mapelli Mozzi – expected later this year
- Princess Eugenie
- August Brooksbank
- Prince Edward
- Vicomte Severn
- Lady Louise Mountbatten-Windsor
- Princess Anne
- Peter Phillips
- Savannah Phillips
- Isla Phillips
- Zara Tindall
- Mia Tindall
- Lena Tindall
- Lucas Tindall