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Most young children use a pacifier or suck on their thumb or fingers.
It is a comforting behavior and doesn't usually need to be restricted. If using a pacifier, try and restrict its use to when your baby seems to need the self-comforting behavior of sucking. Also try and avoid allowing your infant to get into the habit of falling asleep with a pacifier, since she may wake up when it falls out and cry until you put it back in her mouth. After six months of age, you should restrict pacifier use to only when your baby is in her crib so that she begins to lose interest in it. While it is usually recommended that you try and wean your child from thumb sucking or using a pacifier around the time they are six to nine months old, many children continue sucking on their thumb or pacifier and don't stop until around their third birthday.