Sucking is a natural instinct for infants. Many times this habit gives them the sense of security along with the means for ingesting their food, which makes it a difficult habit to break. However, if thumb sucking lasts after permanent teeth erupt, it can cause issues with proper growth and alignment of teeth in their mouths. Help your child by praising them for when they don’t suck their thumb, rather than scolding them when they do. You can take it a step further by rewarding your child, especially during difficult times.