I think DS was about 9 months when got rid of the night feeds. I did it by progressively pushing back the time I would give him a night feed (eg. I wouldn't give him a feed before 2am, then a week later I wouldn't give him a feed before 3am, then a week later I wouldn't give him a feed before 4am, etc). I got DH to resettle him with a bottle of water & cuddles, no boob.