Catherine gave birth to a child, third son of the couple with the prince and fifth in line to the British throne after his grandfather, Prince Charles, his father and older brothers
The royal baby has two older brothers, Prince george, 4 years old, and Princess Charlotte, soon to be 3.
The name pays tribute to his grandfather Prince Charles, who was also called Arthur.
The election also honors Louis Mountbatten, the great-uncle and beloved mentor of Charles, who died by a bomb of the Irish Republican Army in 1979.
The child weighed 3.2 pounds and as is traditional the name of the baby has been the subject of numerous bets.
The favorite names, according to these bets, were Mary, Alice, or Alexandra, if she was a girl, and Arthur, Albert, or Felipe as a child.
Although he is male, he no longer displaces his sister Charlotte in the order of succession, thanks to the reform adopted in 2011.
We wish the whole royal family much happiness.