Prince William has described his newborn son, Prince George, as a “little bit of a rascal”.
“He either reminds me of my brother or me when I was younger, I’m not sure, but he’s doing very well at the moment,” he told CNN.
Prince William also said his son did not “want to go to sleep that much, which is a little bit of a problem”.
The duke admitted he does not get up in the night to see to the baby as much as Kate Middleton, adding that she is doing a “fantastic job”.
Prince William said he believes fatherhood has changed him already.
“The last few weeks for me have been just a very different emotional experience,” he said.
“Something I never thought I would feel myself… it’s only been a short period, but a lot of things affect me differently now.”
Prince George, who is third in line to the throne, was born on Monday 22 July at St Mary’s Hospital in west London.
The world’s media had been camped outside and they got their first glimpse of the new prince the following day when he emerged in the arms of his parents.
Asked about that moment, Prince William said they were “happy to show him off to whoever wanted to see him”.
“I think I was on such a high anyway,” he said.
“As any new parent knows, you’re only too happy to show off your new child and proclaim that he is the best-looking or the best everything.
“It’s nice that people want to see George, so I’m just glad he wasn’t screaming his head off the whole way through.”
After the photo call, Prince William drove his family home to Kensington Palace, and he admitted he had practiced fixing the baby’s car seat into the back of the car.
“I know there’s been speculation about that. I had to practice, I really did. I was terrified that I was going to do some… you know, it was going to fall off or it wasn’t going to close properly,” he said.
“So, I had actually practiced with that seat, but only once before.”
The interview formed part of a full hour-long documentary – Prince William’s Passion: New Father, New Hope - and is to be broadcast on CNN and ITV next month.