The Duke and Duchess of Cambridge have named their baby son Louis Arthur Charles, Kensington Palace said.
In a statement the palace said: “The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles.
“The baby will be known as His Royal Highness Prince Louis of Cambridge.”
William and Kate’s third child, the prince is the younger brother of Prince George and Princess Charlotte, and the Queen and the Duke of Edinburgh’s sixth great-grandchild.