Royal families and governments around the world sent congratulations to Japan on Wednesday over the birth of a baby to Prince Akishino and Princess Kiko.

Britain's Queen Elizabeth II sent a personal message of congratulations to Emperor Akihito on the birth of the new prince, Buckingham Palace said Wednesday.

"Prince Philip and I were delighted to hear of the birth of your grandson. Please convey our warmest congratulations to Prince Akishino and Princess Kiko," the message -- signed "Elizabeth R." -- read.