Prince William plays polo as royal baby watch heats up

Prince William, waiting for his wife the Duchess of Cambridge to give birth to their first child, enjoyed playing in a charity polo match against his brother Prince Harry today.

Bookmakers eye Sunday-to-Tuesday window for Kate Middleton to give birth

Prince William smiles at a child before competing in the Jerudong Trophy polo match at Cirencester Park Polo Club near Cirencester in central England on Sunday. (Luke MacGregor/Reuters)

Britain's royal baby watch may be reaching a fever pitch, but Prince William isn't one to sit tight and wait for news.

Many in the British press have predicted that the first child of the prince and his wife Catherine Middleton is expected to arrive on Sunday. Dozens of photographers and cameramen remain on royal baby watch outside St. Mary's Hospital in London.

Bookmaker William Hill says most people are betting money on a royal birth Sunday, Monday or Tuesday.

But the prince enjoyed a game of polo against his brother Prince Harry at a charity event on Sunday.

The birth, when it does come, will be announced by a bulletin posted on an easel outside Buckingham Palace.

The news also will go out on Twitter from the palace.