DD2 is almost 5 and still sucks her thumb and twiddles her belly button whilst she is doing it. We and nursery are trying to encourage her to stop playing with her belly button. However, she is still doing it and is not even aware she is doing it most of the time. We are concerned that it looks babyish and she will get teased at school . We have tried reward charts, lots of praise when not playing with belly button, painting her nails to stop thumb sucking as she rarely does one without the other, and long dressses which make it more difficult. however it is getting worse. any advice?