Prince William has spoken extensively about how he was overwhelmed by parenting due to the devastating effects of his mother's early death.
In an unusually cordial interview, he described how becoming a father had brought emotions back "by leaps and bounds" and how children were "one of the most amazing moments in life, but also one of the scariest".
In a BBC1 mental health documentary scheduled to air this week, the Duke revealed how he can be surprised by unexpected emotions and how he relies on his wife for support.
Prince William (right) revealed that it was overwhelming to become a father due to the early death of his mother
In a BBC documentary on mental health to be aired on Thursday, he tells of his feelings about parenting
He said: “Especially me and Catherine, we support each other and we go through these moments together and we develop and learn together.
"But I think emotionally things come out of the blue that you never expected, or maybe you think you've dealt with."
William – the father of George, six, Charlotte, five and Louis, two – was only 15 when Princess Diana died, and he rarely speaks about the effects. Still, he opened up when he spoke to footballer Marvin Sordell, who talked about his own depression and attempted suicide.
The former English Under-21 player said three years ago that he had become a father: “It was the hardest time of my life. I grew up without my father … and now I have a child. I don't really know how to deal with it and I really had problems with my emotions at the time. "
In addition to Mrs. Catherine (2nd right), William has three children – six-year-old George (bottom left), five-year-old Charlotte (bottom center) and two-year-old Louis (right)
The Duke of Cambridge discussed his feelings when he became a father with former English Under-21 striker Marvin Sordell (pictured), who had previously suffered from mental health problems and recently became a father himself
In response, a distinctly moved William 37 said, "I can relate to what you say. Having children is the greatest life-changing moment, and I agree with you.
"I think if you've been through something traumatic in life like you say your father isn't there, my mother dies when I was younger, your feelings will come back by leaps and bounds because it is a completely different phase of life and there is nobody there that somehow helps you. And I definitely found it overwhelming at times.
"So I can fully relate to what you say about accompanying children. It is one of the most amazing moments in life, but also one of the scariest."
The Duke participated in the Football, Prince William and Our Mental Health documentary about the heads-up campaign, which aims to use football to convince men to speak on the subject.
Last year he participated in a similar film in which he talked to footballers like Peter Crouch and English manager Gareth Southgate about his mother's loss and called it "pain like no other".
An adjutant said: “The Duke is very passionate about football and thought it was a great way to fight the mental health of men, who traditionally were much more difficult to reach.
William (third from right) is a big football fan and, together with key sports figures, has led the Heads Up campaign for mental health to convince men to talk about their emotions
"How do you reach normal guys who don't talk about their feelings or seek help?" Football can reach men of all ages and backgrounds. Heads Up is a very personal campaign for him. "
This is not the first time William has spoken about parenting, but he has previously focused on the practical aspects of changing diapers, night shifts, and lack of sleep.
When George was born in 2013, he joked that he was "a little rascal that wriggles a lot" and added: "The only legacy I want to pass on to him is to sleep more and maybe not change as many diapers have to. & # 39;
When Charlotte was born two years later, he revealed that it was "the smallest" that brought him to tears.
"It puts everything in perspective," he added, considering his own vulnerability. "The idea of not being there to see your children grow up …"
Football, Prince William and our mental health will be broadcast on BBC1 on Thursday at 8.05pm.
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