William joked about omitting to question medical staff about the one thing the world wanted to know as he chatted with the American leader in the White House’s famous Oval Office.
While William was meeting arguably the world’s most powerful man, Kate, who is five months pregnant, was in New York and in the eyes of a group of young children had been transformed into Princess Elsa from the smash animated movie Frozen.
The youngsters aged three and four, who are receiving help for developmental problems at Harlem’s Northside Centre for Child Development, believed Kate was the cartoon character — and shouted “Princess” when asked who had walked into their classroom.
Rose Ann Harris, the institution’s director of early childhood services said “When they heard she was coming they thought it was Elsa — we said a princess and they got a princess.
The couple are in America on a three-day visit and William flew to meet President Barack Obama ahead of giving a major speech in Washington on combating the illegal trade in wildlife.
William joked with the US leader about George’s birth saying: “I didn’t work out whether it was a boy or a girl.
“The excitement of the event and everything else was just chaos, so you’re suddenly like: ‘Actually it’s a boy in the end’.”
“You forgot to ask?” Mr Obama said through laughter.
With the Duchess expecting their second child in April and the Duke due to visit Japan and China early next year William told the president “it’s going to be interesting next year”.
The Prince sat next to Mr Obama in front of the Oval Office fireplace, a seat often used by visiting presidents and prime ministers.
Kate was greeted by Chirlane McCray, the wife of New York City mayor Bill de Blasio, who joined her for the visit.