Real life superhero! Chris Pratt visits children's hospital as he says son Jack's premature birth inspired him to help

He plays planet hopping hero Peter Quill in Guardians Of The Galaxy.

But Chris Pratt proved he's a hero in real-life as he visited Seattle Children's Hospital on Monday.

The 37-year-old posed visited with various child patients at the hospital as he reflected on Instagram on how the premature birth of his son Jack affected him.

A real guardian: Chris Pratt proved he's a hero in real-life as he visited Seattle Children's Hospital on Monday

A real guardian: Chris Pratt proved he's a hero in real-life as he visited Seattle Children's Hospital on Monday

Pratt, whose four-year-old boy was born nine weeks early in 2012, shared a snap of prematurely born twins Coen and Zion inside the Neo-natal Intensive Care Unit.

He wrote alongside the image: 'Ever since Jack's premature birth, we have a special affinity for the NICU (neo-natal intensive care unit)'.

'Today I spent a little time with Coen and Zion, twins who were born too early only a pound and a half each,' he continued. 'Thank you to the doctors and nurses at @seattlechildrens The boys are doing fine. Although they're both missing their big sis.'

Strong: He also visited with Madisen, a young girl battling cancer

Strong: He also visited with Madisen, a young girl battling cancer

 While he also visited a boy who is a big Guardians Of The Galaxy fan named Rowan

 While he also visited a boy who is a big Guardians Of The Galaxy fan named Rowan

He also visited with Madisen, a young girl battling cancer.

The two struck a cute pose as they both flexed their muscles as Pratt wrote beside it: 'Madisen is #strongagainstcancer. What an awesome kid with such a beautiful smile. She's a lover of art and fashion and she's going places. Thank you @seattlechildrens for the opportunity to come by and brighten some days. My heart is full.'

While he also visited a boy who is a big Guardians Of The Galaxy fan. 

His little man! Pratt seen here with his son this summer; Jack was born nine weeks early in 2012

His little man! Pratt seen here with his son this summer; Jack was born nine weeks early in 2012

Pratt wrote of the meeting: 'Rowan was Groot for Halloween and his brother was Rocket. What an awesome kid. Great parents and from a great family. You're in my prayers tonight little man. Stay #strong @seattlechildrens'.

In 2014 Pratt said during a March of Dimes event that his boy came 'just about nine weeks early.'

'He was three pounds, 12 ounces,' he explained at the time. 'Anna got to hold him for a moment and then it was off to the NICU — the neonatal intensive care unit. Three pounds, 12 ounces. That's a decent size bass. 

Growing fast: Pratt posted a snap of his boy Jack with Anna Faris earlier this year

Growing fast: Pratt posted a snap of his boy Jack with Anna Faris earlier this year

'Very small for a human. He would need a lot. He had jaundice, so they put a blindfold on him and he slept beneath [a] creepy light and he had a PICC line, which is an IV that runs up his arm into his heart. He had a feeding tube and just wires in and out, and he lived in that incubator. That was his first crib.'

He concluded his speech saying: 'I've done all kinds of cool stuff as an actor. I've gotten to jump out of helicopters and do daring stunts and play baseball in a professional stadium, but none of them mean anything compared to being somebody's daddy.' 

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