TMZ Sports talked to Swoggle -- a wrestling star who spent 10 years with WWE -- and he offered advice to Quaden on how he should deal with kids who pick on him.

FYI -- the wrestler was born with a genetic condition that causes dwarfism

"I guess my biggest advice is don't let it get to ya, because that's what they want. All they want is to see you sad. All they want is to see you angry and upset, and just bummed out," Swoggle says.

"The minute you don't let them see that, alright. And it's not right to say, but maybe they'll move on to someone else. Or, maybe they'll just stop altogether."

If you haven't seen the video yet ... it's heartbreaking to watch. Bayles -- born with Achondroplasia dwarfism -- says he wants to die 'cause of bullies at school ... while crying.

Swoggle says it's also up to the people around Quaden to stand up for him when they see something going down.

"The other thing for others around Quaden is, if you see it, stick up for each other. There's no reason for it. There's no reason to let it happen."

The wrestling star says he knows kids look up to him ... and hopes he can be a source of strength to those who are struggling with bullies.

"Hopefully, I can [inspire kids] in some way. Hopefully, [Quaden] sees it as well as other people who might be getting bullied," Swoggle says.

"Hey, it didn't get to me. Don't let it affect your life. Do what you want to do. Live how you want to live and just have fun with life. That's the key. Enjoy life. We only got one, in reality."

"You can only be 9 years old once. You can't go back in time to change it, so enjoy it."