When older brother Archie was born, the update was made two weeks after he was born and when Prince Louis arrived in 2018, the update was made 12 days after his birth.
However, a spokesman for Buckingham Palace previously said the royal family website is "updated periodically".
So what does Lilibet's new place in the line of succession mean for other royals?
Prince Andrew took the biggest hit, being knocked off of eighth place, and down to ninth. Of course, this also meant that everyone below Andrew on the list also dropped down one place.
Above her in the list is Prince Charles, Prince William, Prince George, Princess Charlotte, Prince Louis, Prince Harry and her brother Archie.
Prince Harry and Meghan took inspiration for their daughter's name from the Queen's childhood nickname but said they will call her "Lili".
In a statement, the couple said: "Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet.
"Her middle name, Diana, was chosen to honour her beloved late grandmother, the Princess of Wales."
Lilibet was also a pet name used for the monarch but the late Duke of Edinburgh.
Although it was originally given to her by her grandfather, King George V, because of the way she pronounced her own name.
The line of succession
SOVEREIGN
1. The Prince of Wales
2. The Duke of Cambridge
3. Prince George of Cambridge
4. Princess Charlotte of Cambridge
5. Prince Louis of Cambridge
6. The Duke of Sussex
7. Master Archie Mountbatten-Windsor
8. Miss Lilibet Mountbatten-Windsor
9. The Duke of York
10. Princess Beatrice, Mrs Edoardo Mapelli Mozzi
11. Princess Eugenie, Mrs Jack Brooksbank
12. Master August Brooksbank
13. The Earl of Wessex
14. Viscount Severn
15. The Lady Louise Mountbatten-Windsor
16. The Princess Royal
17. Mr Peter Phillips
18. Miss Savannah Phillips
19. Miss Isla Phillips
20. Mrs. Michael Tindall
21. Miss Mia Tindall
22. Miss Lena Tindall
23. Master Lucas Tindall
