A 6 year old female child reported with a chief complaint of proclined upper anteriors. Parents give a history of prolonged bottle-feeding and a persistent thumb sucking habit. Clinical examination reveals anterior open bite with proclined upper anterior and retroclined lower anterior teeth and associated tongue thrusting.
Usually digit sucking habits are outgrown by:
6-7 years 3-4 years 1-2 years 11-12 years