Especially in today's era, people use "cringe" when describing child actors. One, that's messed up. They're children. Two, they are portraying children in real life, which is usually pretty random and has undeveloped behavior.
This brings me to Noah Grossman's performance in The Babadook. He made it easy for the audience to find him annoying and feel bad for him from beginning to end. I'd love to see the young Aussie actor take on more roles.