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HSC 077 - Does your baby suck his thumb or use a pacifier? Don't worry, these habits are very common and have a soothing and calming effect. The need to suck is present in all infants. Some infants suck their thumbs even before they are born, and some will do it right after being born. Some children don't suck their thumbs, instead they rely on a pacifier. Pacifiers usually elicit strong responses from parents and caregivers. Some oppose their use because of the way they look.