Any of your LO sucks his/her thumb to sleep? Should i discourage that ? He doesn't like pacifier . During the day, he likes to suck his thumb sometimes too

Mine sucks her thumb to sleep. We've tried pacifiers but she spits them out. I prefer her using her thumb rather than a pacifier as I believe it'll affect the development of her teeth. I don't see a need to stop it right now (6m), but I do pop out her finger or replace it with my boob when she's asleep. If she continues when she's grown up, I would talk to her and get her to stop, though I do think a lot of children just stop sucking their thumbs on their own, just like that. Suckling is an instinctive need for infants.