Murray has been in scintillating form ahead of the US Open, beating Novak Djokovic for the first time in nine meetings to win the Rogers Cup in Montreal in August and reaching the semi-finals of the Cincinnati Masters to follow it up.
With a child on the way, Henman believes that becoming a father will help Murray, who won the US Open in 2012, keep a positive perspective and even improve his tennis.
“I’m sure it will be something that Andy and Kim adapt to very well,” Henman told ESPN.
“It will definitely give Andy a slightly different perspective. All those things are going to be positive for him.
“Andy’s always had a very good perspective on the game and certainly when you get married, and with a baby on the way, it does just emphasise that what you’re doing on the court is actually only a game.
“There’s never been any question marks about Andy’s commitment and dedication to his job and I’m sure having a child will just emphasise that perspective even more.”
Henman pinpointed Murray’s win over Djokovic in Montreal as being crucial for the Brit’s confidence ahead of the US Open at Flushing Meadows.
“It was a big win on many fronts. First and foremost, to beat the best player in the world is going to be great for his confidence,” Henman said.
“Secondly, the fact that Andy hadn’t beaten him [Djokovic] in two years is a good hurdle to overcome. Thirdly, he’s playing as good a tennis as I’ve seen in a long time. Probably the best tennis I’ve seen him play in his career so I think it bodes very well.
“When you look at his performances from the first eight months of this year, I think it’s been the best and the clay court season was a big stepping stone.
“He really did play exceptionally well on the clay, winning two titles, winning in Madrid beating [Rafael] Nadal. For me this is his best period of play and it will be interesting to see if he could add to his grand slam tally. I really believe he can.”