How to stop thumb-sucking?

My son is 20 months and I think it’s time to put a stop to the thumb-sucking. He used to only do it to get to sleep or when he was sick/upset but he’s been doing it a lot more the past few weeks and he actually got a blood blister!! I feel awful. He has never taken a pacifier. I was wondering what products or methods helped you? How long did it take, etc. appreciate the help!!

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