The new series sees 7 to 14-year-olds competing in a singing competition based on the main show.
Some viewers however have been left uncomfortable with such young contestants taking part - but Emma says it's fine.
She told the Daily Express newspaper ahead of the semi-final that the kids actually cope better with the pressure than the adults.
"They tend to take it better than the grown-ups because they're innocent," she said. "It's fun for them, whereas grown-ups are more like, 'This is my last chance!'
"Some of [the kids] get a little bit upset but it's normally the ones who are a little bit older."
The Voice Kids coach Pixie Lott agreed: "I think from my experience, because I started really young, it put me in good stead for everything that has happened to me.
"I think it's great to have this experience at this age; the younger they are, the more fearless they are.
"They can learn and keep going and having amazing experiences like this and the show is exciting because it's just kids."
The Voice Kids sees a number of differences to the main show, with all coaches turning in the blind auditions to offer feedback even if no buttons are pushed.
There is also just the one live show, the final on Sunday, where the winner will be voted for by the public.