Busted! I snapped this photo of Chloe sleeping. Sucking her thumb. tut tut tut. Chloe only started sucking her thumb a few months back after seeing someone at day care doing it. Now she can't stop - it's comfy she tells me! At first we thought it was cute, but now, it's becoming a little bit of a problem. She is getting calluses on her thumbs and they are getting cracked and nasty. We have tried a few things to help her stop and they are working during the day, but she is still doing it in her sleep. What have you tried that works? How do you stop a thumb sucker sucking their thumb? Say that 3 times fast!