T.
Hi S.,
My son is 3 1/2 and sucks his thumb mainly when he is tired or relaxing at home but I did ask my pediatrician about how and when I should get him to quit and he told me to have some sort of signal that is just between you and your child (like tapping your nose or pulling your ear) and when your child catches this signal they are to take their fingers/thumb out of their mouth. You obviously have to tell the child this is your special signal ahead of time. I have not tried this and I am not sure if it would actually work but my pediatrician said that basically kids do not even notice that they are doing it because it is such a habit. He said you just have to be consistent and it should work. I am not sure about it but he has been right about so many other things that sounded just a little too easy to be true so I will give it a try. Just thought I would pass along the info. Good luck.