By Paul Harrison, Royal Correspondent
Prince William has revealed his son Prince George is "a little fighter" who "wriggles around quite a lot and he doesn't want to go to sleep that much".
In his first interview since becoming a father, the Duke of Cambridge talks about his "emotional experience" of the past few weeks, adding that his son is "a little bit of a rascal".
In the interview, which took place at Kensington Palace on August 2, William said: "Well yeah, he's a little bit of a rascal, put it that way.
"So he either reminds me of my brother or me when I was younger.
"He's doing very well at the moment. He does like to keep having his nappy changed."
Asked if he had changed the first nappy, the Prince replied: "I did the first nappy, yes. I had every midwife staring at me ... 'You do it, you do it'.
Prince William has given his first full interview since the birth
"He's growing quite quickly actually, but he is a little fighter.
"He kind of … wriggles around quite a lot, and he doesn't want to go to sleep that much, which is a little bit of a problem."
The Duchess of Cambridge did not take part in the interview.
Conservation efforts by the Prince's Charity Tusk Trust was the focus of the half-hour interview.
Asked how new mum Kate was coping with motherhood, Prince William said she was doing the lion's share of the night-time shifts, adding: "She's doing a fantastic job."
Reflecting on how he and Kate felt as they emerged from the Lindo Wing on July 23, the day after Prince George was born, William said: "I think more shock and dauntedness was the feeling I felt.
"I think I was on such a high anyway, and so was Catherine about George, and we were happy to show him off to whomever wanted to see him.
William and Kate left hospital cradling the new prince
"I'm just glad he wasn't screaming his head off the whole way through.
"As any new parent knows, you're only too happy to show off your new child and, you know, proclaim that he is the best looking or the best everything."
The search and rescue pilot was also asked about the pressure he might have felt handling a car baby seat for the first time in public.
He said: "Believe me, it wasn't my first time. And I know there's been speculation about that - I had to practise, I really did.
"I was terrified it was going to fall off or it wasn't going to close properly. So, I had actually practised with that seat, but only once before."
The Duke of Cambridge is known for doing things his way, and spoke about choosing to drive the vehicle from the hospital to Kensington Palace.
Prince William said that driving his young son home was important
"Where I can be, I am as independent as I want to be, the same as Catherine and Harry," he said.
"We've all grown up differently to other generations (of royals), and I very much feel if I can do it myself, I want to do it myself.
"I think driving your son and your wife away from hospital was really important to me, and I don't like fuss, so it's much easier to just do it yourself."
The Duke also talked about his hopes for his son George, saying he plans to bring him up as if he is growing up "in the bush".
"I'll have toy elephants and rhinos around the room. We'll cover it in sort of, you know, lots of bushes and things like that, make him grow up as if he's in the bush."
But it seems sleep is the priority for the royal couple for the moment: "At the moment, the only legacy I want to pass on to him is to sleep more and maybe not have to change his nappy so many times."