The official birth register entry of Prince Louis Arthur Charles of Cambridge.
His dad's said Prince of the United Kingdom and his mom's said Princess of the United Kingdom.
The document, which was registered on Tuesday, states that Prince Louis was born on April 23, 2018, at St. Mary's Hospital in Westminster, that his sex is male, and that he lives at Kensington Palace London W8 4PU.
If the Cambridges follow the same pattern for the new royal baby as they did for their two other children Prince George and Princess Charlotte, we should expect to catch another glimpse of the little prince via a first official portrait. The title of princess was originally withheld from the wife of a British prince, however, the Queen changed this rule in 2012 to allow Kate to have the title alongside William.More news: Trump says leak of Mueller questions regarding Russian Federation probe 'disgraceful'
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The royal couple has spent the last week getting to know the new prince and celebrating with the royal family. In comparison, the royal couple's two older children's names were announced two days after their births.
According to reports published before the announcement, Albert and Arthur were the odds-on name favorites.
The baby was given the title His Highness Prince Louis of Cambridge.
The birth means that the Duke of York is now seventh in line to the throne (he was second at the time of his birth) and could marry without the Queen's permission.
While Arthur was a favorite with bookmakers, and Charles a no brainer after Prince William's father, Prince Charles, Louis was a rank outsider with odds of 20 to one.