H.D.
I sucked my middle two fingers until I was 9!!! When one hand calloused, I would go to the other... and back and forth. By the time I started school, I would only suck them at nap time and bed time. It was a comfort that I loved as I was going to sleep. Finally, after my dad had tried everything (hot sauce, taping a pencil to them, ...), he did the only thing there was left to do... he threatened to take away my allowance... and I quit that night! My teeth did not suffer, infact I always get commented about my smile! Point in story... don't worry about it. Every child is different... and every child has their own habits! My daughter is 9 1/2 months old... and sucks the same two fingers! and although I hope that she doesn't suck them as long as I do... I know it's all part of her growing up and her own little personality.