DS1 was a reflux baby so had the dummy from 4wks. He gave it up easily at 3yo (by 18mths he only had it for sleeps). He breastfed for 8mths and i weaned as he was a biter. Im not sure if it was the dummy that made him bite.
DS2 is 9.5mths and has never had a dummy. I wish he would take one, he comfort sucks on me aaaaalllllllllllllll night. Ive tried 5 different types and he wont take one. He is still breastfed.