Please answer

Does the length of time you breast feed change the way they change afterwards? I'm sorry I'm not making any sense, um, what I'm trying to say is I want to breastfeed for 1-3 years or as long as I can (four years at most) but I'm getting a breast reduction (DD to B-cup) before my husband and I start TTC, so I'm wondering if breastfeeding that long will keep my breasts from going back down to a B-cup? Because I would hate to be above a C-cup again and it'd be a pain to get the surgery again. Thank you in advance :)