Prince Charles has admitted he may struggle to keep up with his expanding brood of grandchildren following the birth of Prince William and Kate’s third child.

The heir to the throne spoke of his “great joy” at the arrival of the Duke and Duchess of Cambridge’s new son on Monday.

A day after the birth, Charles said both he and his wife Camilla, the Duchess of Cornwall, are “so pleased at the news”.

In a statement, he added: “It is a great joy to have another grandchild, the only trouble is I don’t know how I am going to keep up with them.”

The new prince, whose name is yet to be revealed, was visited in hospital on Monday by his brother Prince George, four, and sister Princess Charlotte, two.

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Camilla also has five grandkids from her two children Tom Parker Bowles and Laura Parker Bowles, from her first marriage.

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