Thumb, finger and pacifier sucking
Is completely normal for babies and young children, because it provides them with a sense of security and comfort. In fact, babies begin to suck on their fingers or thumbs even before they are born!
Most children stop sucking on thumbs, fingers, pacifiers or other objects on their own between two and four years of age. No harm is done to their teeth or jaws. However, some children repeatedly suck on a finger, pacifier or other object over long periods of time. In these children, the upper front teeth may tip toward the lip or not come in properly.
Your pediatric dentist will carefully watch the way your child’s teeth come in and jaws develop, keeping the sucking habit in mind at all times. For most children, there is no reason to worry about a sucking habit until the permanent front teeth are ready to come in. Talk to your pediatric dentist about your concerns regarding your child’s habits.