I hope no one takes this the wrong way, but maybe breasts have a THIRD function. At least, I like to think so. I agree that they are meant to be used for feeding a baby. I also agree they are good for attracting men. Or women, if that's what one prefers. But has anyone ever stopped to think about our OWN pleasure? How many women like it when their partner pays attention to their breasts, in one form or another?
As for the doll, I have a bit of mixed feelings. I think breastfeeding is a wonderful thing; healthier, better bonding experience, etc. I would do my best breastfeeding my children when the time comes. However, I think a breastfeeding baby doll is much too personal. It's one thing to have a doll pee out water, but to have a doll make sucking noises when you put it up to a nipple sensor on your breast? Girls that young don't even really have breasts! Don't get me wrong, I think it would be a great teaching tool for later on, like in high school where you get those mechanical babies, but for a young girl, I think not.
I'm not a parent, but this is how I feel.