The film is R-rated in the US, meaning the child actors can’t technically watch it in cinemas.
But being such an integral part of the long-awaited horror, director Andy Muschietti showed them a cut of it at the end of the filming process.
Although adult audiences may well be shaken to the core by the terror of Pennywise the Clown, it seems the kids loved it.
“They saw it in an early stage,” Muschietti told Den of Geek.
“When we were reaching our final stages of edit, so it was a rough final version, not all the effects were there, but we did something up in Toronto and we reunited the cast and it was a great opportunity for them to see the movie.
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“I showed it to them. The conditions weren’t great because we didn’t get a super-good theatre, but at least they saw what it was all about and they all loved it. They were all thrilled.
“We all had so much fun doing this. It was summer and for the kids, if you ask them, it was like the best summer of their life doing it, so for them it was all like playing.
“It was a really fun experience. Very stressing because the restrictions of time, when you shoot with kids, are terrible. They’re always taking them away!”
He added: “They understood their characters perfectly and they had a lot of help in building them. And also there was a lot of improvisation.
“A lot of scenes that are funny in the movie are improvisations, departing from the script and basically giving the kids freedom to play with the words and escalate.”
Stephen King has also passed his verdict on the film – and it seems to have passed with flying colours.
Bill Skarsgard plays Pennywise, taking over from Tim Curry.
It is out on Friday, September 8.