mine is 17 months, nursing once around 10am(short nap) then again in the afternoon for a longer nap(sometimes I don't nurse him for this nap if we are out and about and he falls asleep in the car, and other times, he just falls asleep playing or snacking on cereal or such), then again at bed time(sometimes, but not if DH can rock him to sleep, or if we put him to sleep by driving him around) then, about 3/4 of the time, i nurse him at night, or early in the morning when he wakes up(tired and crying, it puts him back to sleep). We still co-sleep, and I love it, he wakes up whether he's in his crib or in our bed, and at his age it doesn't matter too much. I do notice that he nurses less if the milk is less accessible. If I'm wearing a tank top, he remembers that he could nurse if he wanted to, and usually chooses to, but I'd rather not nurse him, so I opt for long sleeve, non-stretchy shirts(so he doesn't pull it down and see the goods) when I know hes going to be climbing on me(i.e. days I spend sitting down at his level, as opposed to the days I spend standing in the kitchen cooking or cleaning.)