Thumb sucking is a normal developmental process for infants and young children. The habit many times will stop without help around age 3, but sometimes it is a difficult habit to break. Children who continue this habit usually do it to relax, beat boredom, or fall asleep. If your child has not dropped the habit by age 5, stay positive and try discussing it with them. Another option is to place a bandage (band-aid) on their thumb, this may change the sensation the child receives from thumb sucking. Avoid using a bad tasting liquid to prevent thumb sucking, depending on what is used, this method may not be safe for your child.