The problem lies more with prolonged thumb-sucking or pacifier use. If a child continues to use a pacifier or suck her thumb past age three to five years, then it can affect her teeth and speech and language development. Fortunately, most infants give up these habits well before they become a problem, often by age six to nine months. To help keep this healthy habit from turning into a bad habit, you might try one of the following strategies:
Avoid the types of pacifiers that clip on your baby’s clothes, which makes it always available Avoid giving the pacifier at bedtime, or quickly take it out of the baby’s mouth once she falls asleep Avoid letting your baby have a pacifier all day long Make the pacifier less available once your baby begins to lose interest in it Get your older infant attached to another type of security object, like a small blanket, instead of the pacifier Don’t be so quick to put the pacifier back in her mouth each time it comes out
If trying to break your child’s pacifier habit is too stressful for her, it’s okay to let her continue to have one. Since there likely won’t be any damage to your baby’s teeth unless she continues to use a pacifier after she is two to four years old, you don’t have to be too aggressive at this age unless you begin noticing problems, such as a speech delay or tooth deformities.