He started doing this last night....and he stayed up late doing this!! He just turned 5 months...so i am assuming it may be him teething. What should I do or give him to stop this. He's never done this before. And he's been okay in his crate since we got him. I noticed he licked the bars alot last night. I kept trying to correct him..but eventually it got late and I went to bed. Please any advice would be great!