Thumb sucker?

My 3.5 month old recently decided to suck her thumb, and now she does it all the time. She never took a pacifier, so perhaps this is how she soothes herself. I used to suck my thumb as a kid and it was so hard to stop. I think I was in 3rd grade when I finally stopped. Is there anyway to prevent her from this habit, or should I just let her?

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