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The Duke of Cambridge, who scored the winning goal for his team at the charity polo match, was presented with a mini polo stick for Prince George by Audi UK director Martin Sander after the match.
William and Prince Harry's Audi Quattro team, which also included brothers Mark and Luke Tomlinson, beat their rivals, with the final score at five to three-and-a-half.
In the presentation ceremony after the match, William was presented with a mini polo stick for Prince George by Audi UK director Martin Sander.
William jokingly asked if it was nappies, quipping: "I've got to pick some up on my way home."
The 31-year-old admitted it was "good to get out of the house" for an afternoon.
Meeting guests afterwards, he added: "He likes to move around a lot, he wriggles a lot, he keeps us on our toes."
The Duke of Cambridge has made his first public appearance since leaving hospital with his newborn son, playing in a charity polo match alongside brother Harry.
William took a break from paternal duties to play in the Audi Polo Challenge at Coworth Park, Ascot, Berkshire.
The charity match is held each year and this year's event was in aid of charities SkillForce and The Royal Marsden Cancer Charity, of which William is patron and president respectively.