She was really young. Like 2 I think. We've had her since she was like 8 months old, and she's done it almost the whole time we've had her. She is a really bad cribber too. Nothing seems to work, but today I discovered that she HATES bag balm, so I put some on her favorite cribbing spot, and I think it may have worked. Who knows... I guess we'll have to see.