DD is 12 months old, and as far as I can tell, she has no idea where my breasts are. Once one is within sight, she definitely knows that milk comes from it and she latches on in a hurry, but if they're under my shirt (or even my bra) she doesn't seem to know they're there. Like, she won't pull up my shirt or claw at my bra or anything. She just sits there and waits.
Don't get me wrong, I'm still glad that she hasn't gotten to the "helping herself" phase, but I'm just wondering when some of your LOs got to that phase. I know that DD has the skills and knowledge to do so, she just doesn't.