My 3 week old poult was doing the same exact thing this evening, which is why I searched out Backyard Chickens for advice. I had given her some grit in the meantime and it seams to have cured her. She was also "puffing" out on the sides of her beak when she was yawning. Everything stopped with the grit. They say that new chicks and poults don't need to have grit if they are on a starter feed but sometimes they will try to eat their bedding or if you give them anything else to eat I think they really need it.