William, the Duke of Cambridge and Prince Harry notched up a record trade for 25 billion euros but still had time to poke fun at each other, and play jokes on professional traders, at the BCG Partners brokerage in London's Docklands.
They spent nearly an hour negotiating deals during the firm's annual charity day to raise money in memory of its 658 employees who died in the 9/11 attacks on the World Trade Centre in New York exactly 12 years ago, the Telegraph reported.
He said: "He's on the phone, it's all baby chat."
Asked how baby George is getting on, the Duke told one trader: "He's very well thanks. He's sleeping quite well."
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At one point Prince William said to a broker: "Bloody hell, was that a billion?"
After the trader nodded, the duke turned to Prince Harry and said: "Apparently, we should work here."
BGC broker Nick Thompson mentored Prince Harry through the deal he made alongside the duke.
"Prince Harry was far more confident. Prince William was too busy with the baby chat, rather than the numbers."
All profits from the trades during the course of the day are donated to charity, including the duke's SkillForce and Prince Harry's WellChild organisations, the BBC reported.