our dear son is alredy coming 4yo, but i remembered as a bb he used to suck his thumb too.
unfortunately, i can't remember what we did to try to deter him frm doing so.
one morning, we took him to see the doc (24-hr) at tmc. Can't remem what we brought him there for..anyway, i remem the doc examined him n later asked if we had any problems or questions related to our bb. We told him about his thumb-sucking problem, n the doc actually advd us to give him a pacifier. Told him our unwillingness to do so, coz we, like all you mothers here, didn't want our kids to have a habit
The doc shared his experience with his 3kids, and assured us that bb will know how to wean off the pacifier in no time.
Indeed our boy did..at times when we thot he should hv it, he wud throw it out w his tongue.
So mummies, i personally feel you should try the pacifier or a teether or something else like a blankie iso of chilli sos, ru yi you, the nail thing that taste like cutex as all these are extremely harmful to the bb/chd.
jmho and hope this info helps, eventually