do your baby or small child suck their thumb?

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Many babies love to have something to suck on, and that one thing is usually their their thumb. Many mothers will pull the thumb out of the baby's mouth and stick a pacifier in. Does your baby suck his/her thumb, and if so, do you try to break that habit? Do you substitute the thumb for a pacifier? How old was your child when they stopped the habit. My sister used to suck her two middle fingers, my mother try everything from hot sauce to socks, she eventually stopped.