Andy Murray says he is already finding it difficult to be away from his baby daughter.
Wife Kim gave birth to their first child Sophia on February 7, exactly two weeks after Murray lost to Novak Djokovic in the Australian Open final.
Murray has since taken a month off but has been practising at Wimbledon ahead of his return to the court as Great Britain begin the defence of their Davis Cup title with a first-round tie against Japan in Birmingham this weekend.
He told The Guardian: "The thing that has surprised me most is how quickly everything changes -- from the first day she was born. You don't notice it when you're there every day but you look back at a photo on the day she was born to one taken five days later to now, a few weeks on, and you see how much things change on a daily basis.
"I really don't want to miss seeing those changes. Even when I'm away for a day I feel bad. I feel I should be there and I want to be there as much as I can. So when I'm leaving the house at eight in the morning and getting back at eight at night, I feel bad."
Murray became the first person to lose five finals at the same Grand Slam with his straight-sets defeat to Djokovic.
He had admitted before the tournament that he would fly home early if his pregnant wife went into labour, and also had to deal with concerns over his father-in-law Nigel Sears' health after the 58-year-old collapsed in Melbourne while Murray was playing a third-round match.
The Scot paid tribute to Kim after his final defeat, thanking his wife for being "a legend" over the previous fortnight, and revealed he is adapting quickly to daddy duties.
"I was OK holding her [Sophia]," he added. "The only thing I found difficult was changing her because you see a small person and you think they're so fragile -- or that their hands are so small that when you're putting their fingers through their top that they could maybe break.
"But when you see all the midwives -- and Kim has a good friend who is a midwife -- they're a lot rougher and they do things much more quickly. Lots of people have told me babies are a lot more resilient than you think. They're not going to break.
"After the first couple of days I felt much more confident."
The last five majors have been won by fathers, four of them claimed by Djokovic and one by Stan Wawrinka. The Serb in particular has played some of his best tennis since becoming a parent in October 2014, winning 15 of 21 tournaments he has entered, including four Grand Slams.
Roger Federer has also enjoyed a resurgence since wife Mirka gave birth to their second set of twins in May 2014, denied an 18th major title by the brilliance of Djokovic in the past two Wimbledon finals, as well as the 2015 US Open final.
But Murray admits it is "tough to tell" whether he will experience a baby boom in the Grand Slams.
"I've been training again and certainly haven't been worse," said Murray. "I've been very motivated in practice. Obviously with Novak and Roger it's worked out well. I don't know if having kids has made them play better or if they're just really good.
"For other players it hasn't worked out as well. But [fatherhood] is a positive thing -- and tennis not being your priority can help. It lends perspective when you have a bad loss or bad practice. The outcome of a match is not everything but I want my daughter to be proud of her dad when she grows up and sees what I did. I hope it works out in a positive way on the court but if it doesn't, it's not the end of the world."
Murray also said he did not need much persuading by Leon Smith to feature for Britain this week against Japan, who will be led by world No.6 Kei Nishikori.
"I always wanted to play providing everything went well with Kim and the baby," he said. "It's going to be a tough tie. Last year the toughest team we played was France and they didn't have anyone ranked as high as Nishikori. He's capable of winning two singles.
"I lost to him once at the World Tour finals in 2014. We've played six times so I've won five. But he's one of the best players in the world and I won't have played a match for almost five weeks. That's the longest break I've ever had at this stage of the season. There are no guarantees but hopefully I can play well and help the team win."
Following their Davis Cup triumph, Murray's older brother Jamie has also become a Grand Slam champion with victory in the Australian Open doubles final with new partner Bruno Soares.
The siblings combined to contribute vital doubles rubber wins in the ties against France, Australia and Belgium last year, with Murray admitting his involvement in the doubles against Japan depends on how the singles go on Friday.
"When you haven't played for a long time things hurt a bit more after a match." he said.