William was taking a break from his parenting duties Saturday to play alongside his brother Harry at the Audi Polo Challenge in the English village of Ascot.
William and his wife, Kate, had their first child, Prince George, on July 22. The young father told guests at the event that it was "good to get out of the house" for the afternoon.
The 31-year-old managed to score the winning goal for his team and was later presented with a miniature polo stick for his newborn son.
He jokingly asked if he'd be getting diapers instead, telling guests he had to "pick some up on my way home."