How stop baby from thumb sucking

SN

My LO takes off his mittens in just a minute when I put him, and starts thumb sucking.

I am not favor of this way of pacifying,there are other ways too.

He used to take pacifier but no more.

How to stop thumb sucking plz help.

I have seen my nieces and nephews sucking thumb and now that they got blisters on their thumb, and thumb has become very thin too.

Help mommies if You are aware of ideas.