thumb sucking
my girl has been sucking her thumb since she was a few months old. I don't really think its too bad cos at least she can self sooth. She only sucks her thumb when she is feeling sleepy. BUT i would like to wean her off the habit when she is around 2, so might try the bitter 'nail polish'. I don't think its bad for tooth alignment, my bro was a 2 finger 'sucker' when he was young, his teeth are perfectly straight, so are mine.
BUT prolonged habit is not good. I have a friend who has 1 thumb slightly longer than the other, apparently he only stopped his habit when he was quite old.