When deciding on a size of implant for breast augmentation, there are many factors to take into consideration. It is not simply the height and weight. We need to know how many children you have had, whether you are breast feeding, whether you plan on having more children, whether the breasts are sagging, what your measurements are (sternum to nipple, breast width, medial and lateral pinch, breast height, upper pole pinch, evenness of the inframammary fold, etc.). Once we have all this information, then we need to understand the patient's wishes. What is the look you are going for? Are you looking for a size that will make you look bigger, but still natural in appearance? Are you looking for a size that will make you a lot larger, and you are ok if it is not still "natural" in appearance? These are a few of the questions that need to be answered before we are able to determine what size implant is ideal for you. Make a consultation with a good plastic surgeon. Bring in pictures on women whose breast size and shape you like. When I see patients for a breast augmentation consult, I usually visit with them 2-3 times before the actual surgery. When we are both satisfied that all the above questions have been answered, then only can we proceed with the surgery. Good luck in your endeavor!