I had this issue with my daughter. I read a lot of on-line articles, and nothing worked.
I am sorry, It’s not the first time psychology has come short for me.
All along I thought the solution should be simple, and it was! No need for psychology or expensive gadgets!
I just put a sock on her hand like a glove and some duck-tape around her wrist to keep it. One week and the thumb-sucking was gone forever.
