Prince William has joked that being a dad has so far been all about "nappies, nappies, nappies".
The new father's comments came as he teamed up with his brother Prince Harry for an afternoon of polo in Berkshire.
"It's good to get away for the afternoon," the Prince told guests at Coworth Park, admitting he was "in baby mode", and so was not really "in the zone" for the match.
The charity fundraiser was the Duke's first public engagement since he and the Duchess of Cambridge left hospital with baby son George on July 23.
After scoring the winning goal, Prince William was presented with a mini polo mallet for his nearly two-week-old son.
Joking afterward, the Prince admitted George had been crying a lot and asked one guest if they fancied "coming to do a little babysitting".
The Duke's two weeks' paternity leave is due to end shortly, which means he will return to work as a search and rescue pilot at RAF Valley in Anglesey.
It is unclear whether he will be joined by Kate and their son to show him off to colleagues and friends at the base in Wales.
Kensington Palace is expected to announce in the coming weeks the direction the Duke's career will take.
It is thought he will leave Anglesey and return to a London-based role.
The polo match was not only an opportunity for William to have some quality time with new uncle Prince Harry, it was also a chance to raise money for two causes the Duke supports, Skillforce and The Royal Marsden Cancer Charity.
"The Duke and Duchess have done so much to support us and now they are a family, it's just wonderful news," Peter Cross, Skillforce's chief executive, said.
It was a view shared by The Royal Marsden Cancer Charity's chief executive, Cally Palmer, who said: "The couple has been so supportive, they have such affection for the children they've met and now they have a little one of their own."
Prince William now returns to fatherly duties, but joked with another polo guest, not before "picking up more nappies on the way home".