Lol you go girl!Bless him he will soon forget and he'll be up to too much mischief to care!Just don't give him something to replace it.
I'm 19 and still suck my thumb

when I was little my mum left me to have a bottle till I was 3, I moaned so she told me so suck my thumb instead and I did and still do!!!Tried to stop it but can't. So now my teeth stick forward and I have a gap due to this. Not good.