My DD 'stopped' bfing overnight quite young, less than 6 mths. She then started again at about 14-16 mths and didn't 'stop' for a few months. In the end, as she was doing it out of habit and hadn't done it for so long (which was playing havoc with my sleep since I had to work some days!), I introduced a cup of water instead and if that distracted her, she wouldn't have a bf. Once she was taking that the majority of the time I got a bit firmer and wouldn't let her, but she was well and truly approaching 2 by this stage.