At 18 months my DD woke pretty regularly and a breastfeed was the only thing to get her back to sleep. She'd go to one wake up, then for a while back to three. Sometime between 18 months and two years she just stopped. Now a "bad" night is only one wake up in the early morning, it's great! And she no longer feeds back to sleep, just a pat on the back, tell her mummy is here, and she rolls over and goes back to sleep. No pushing on my part, she was just ready.