He may only be a few days old but punters are already placing bets on what the future holds for Prince Louis - from his chances of playing football for England to becoming king.
Louis is fifth in line to the throne and a sixth great-grandchild for Queen Elizabeth, who turned 92 on Saturday, and her husband Prince Philip.
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The baby is the couple's third child and is the first little prince to be affected by a 2013 change in British laws that made birth order more important than gender in determining the line of succession to the throne.
As for Louis? That was the name of Fleur and Bill's youngest son.
Australian High Commissioner Alexander Downer also suggested Alexander, to which William said cryptically: 'Funny you should say that.It's a good name, ' The Sun reports.
The middle name Charles is a tribute to the duke's father, the Prince of Wales.
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She said: 'One week of snow doesn't explain a decade of weak growth, dismal productivity and falling wages. The dismal growth numbers for Q1 must mean pressure on the Bank of England to delay hiking interest rates.
Kensington Palace said it would be announced in "due course".
Louis enters the full name of Prince William is William Arthur Phillip Louis - and George - George Alexander Louis. They named him Louis earlier this week.
It hasn't yet been announced who will be Meghan's bridesmaids and page boys, but William and Catherine's oldest children, Prince George, four, and Princess Charlotte, two, are expected to form part of the wedding party. His siblings' names were revealed two days after their births.
Bookmakers had Arthur as the favourite for some time, with James and Philip also popular.
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William joked on Monday that he had "thrice the worry" now as he took the prince home to Kensington Palace, after the baby's debut on the steps of the exclusive Lindo Wing maternity unit in London.