Nonnutritive sucking satisfies a psychological need and diminishes with age; most children stop by two to four years of age. Persistent non-nutritive sucking increases the risk of anterior open bite, palatal narrowing, and delayed speech development.
Anticipatory Guidance

American Academy of Pediatric Dentistry. Policy on pacifiers. The Reference Manual of Pediatric Dentistry. Chicago, IL: American Academy of Pediatric Dentistry; 2025:86-9.
Brecher EA, Lewis CW. Infant Oral Health. Pediatr Clin North Am. 2018; 65(5): 909-921.