Amir Khan believes he is discovering a new maturity as a fighter after moving to a new trainer and taking on responsibility for brother Haroon's boxing career.

Khan won his first two fights under San Francisco-based Virgil Hunter after consecutive defeats against Lamont Peterson and Danny Garcia saw him lose his light-welterweight world titles.

The 26-year-old's most recent fight, a points win over Julio Diaz in April, saw him down in the fourth round and Khan has been working on a more disciplined approach as he bids to set up a challenge to IBF welterweight champion Devon Alexander, which is pencilled in for December 7 if a deal can be struck.

"The last few fights I have learnt a lot," Khan said.

"I used to make a lot of mistakes. Virgil is working on my stance and making me a bit more experienced and a bit more careful and cautious in there.

"We are fighting top-class fighters now, so we have to be smart, we can't make mistakes. Virgil is teaching me to be more focused in the ring.

"And even out of the ring, training in between camps, keeping fit and keeping ticking over."

Khan has also found another new perspective by guiding 22-year-old Haroon through the early stages of his professional career. The 2010 Commonwealth Games bronze medallist has won his first two professional fights.

Khan said: "I'm promoting and managing Haroon and I'm trying to get him on in America three more times this year, maybe once on the undercard of my fight and two more times working alongside other promoters.

"I am going to advise him more than anything. The training is up to him.

"Haroon is a talented fighter and I believe he will be world champion."

Super-flyweight Haroon feels his older brother's experience will help him plot his way to the top but he was surprised to see his mentor looking so impassive when he won his latest fight with a first-round stoppage in May.

The younger Khan said: "I was watching the video and saw him at ringside and he was just sitting there. I said to him: 'Why were you not happy?'

"He said he was nervous. Now he knows what we go through when we watch him boxing."

The older Khan responded: "I have seen a lot of knockouts. I'm not going to jump up, I was keeping it cool.

"One of the good things in that fight was that he didn't make the mistake I made in the past, rushing into opponents then you get caught yourself.

"He walked in and boxed. I didn't want to show too much excitement in case he got caught up in it.

"You are probably more nervous watching your brother because you are not in control."

The brothers were in Scotland on Saturday handing out gifts to children at the Royal Hospital for Sick Children in both Edinburgh and Glasgow in an event organised by charity Colours of Islam to mark the end of Ramadan.

Amir Khan, who will step up his training after the end of the month of fasting, said: "Ramadan is tough, it's about feeling what the poor people around the world are feeling, and that makes you give more."