I sucked my fingers as a child and it totally reshaped my palette. Pre-orthodontic work, I remember being able to put those fingers in my mouth and my teeth and palette fitted perfectly around them. I stopped when I was about 5 or 6 but it was too late for my poor old teeth.

Mum couldn't get me to have a dummy either but also figured I would grow out of it, not realising how bucky my teeth would become (it does seem to be luck of the draw, some kids get away with it, others don't).

But at this age I'm not sure how you can stop it, when babies need to suck for comfort. Maybe try a couple of different types of dummy - silicone, latex, orthodontic, cherry? Otherwise I'd just let it go for now and see if it's just a passing habit. I think it's when they constantly suck past the age of about 18 months or so that it starts causing the teeth to re-align, so maybe be vigilant about stopping the habit when bub is a bit older.