Looking at your photo you are athletic and trim. It depends what size you desire to be after your breast augmentation. Your breasts appear firm and do not sag. You did not mention if you nursed your children, and if you did how big did your breasts get. The size of your breasts when you were pregnant may help you decide on what size you want to be. To achieve and natural appearing breast augmentation you might considered a full B or small C. When selecting an implant for a natural breast augmentation appearance, the diameter of the breast implant should be 1 cm smaller than the base width of your breast. This will limit the width of your breasts and not make them appear to wide. Some women refer to this as "side boob"". A full B should be 250 to 300 cc, and a Small C should be 300 to 350cc. During your breast augmentation consultation you should try on sizers to help you decide the the size you desire to be. I also like to see photos from Victoria Secret , to big, to small, just right to help me see in your minds eye, what size breasts you like. Also, women with smaller breasts are quite happy with their new breast augmentation results, but after six months many women wished they went larger. Jon M. Grazer, MD,MPH, FACS Second generation Newport Beach Board Certified Plastic Surgeon.