I am 5'1", 105 lbs, & 32AA, I would like to achieve a low C cup look, would 245-255cc Sientra round implant be too small?

Hi Gummybear,You have received some great answers below!  Great advice.  I will list a few tips for you also.  My gut is telling me, without knowing you or examining you or seeing any photos, you won't make a "C". Cup size estimates can be
misleading, but I generally advise patients that they will experience an
increase of approximately one cup size per 200 cc. You can try on implants in
the office by placing them into a special bra. Approximately 50 cc (1-2 oz.) is added to the final volume to account
for flattening of the implant in the partial submuscular pocket. Once you
decide on a size you like, then add on about 25-50 cc, because in real life the
implant will be flattened slightly by your tissues.Multiple measurements need to be taken to fit
an implant to your exact anatomy. Have your surgeon's office show you the
charts of the implant dimensions for the various profiles of silicone and
saline from the manufacturer. Then you and your surgeon can piece
together the puzzle by matching your measurements, with your wishes, versus
your tissue cover and the available implants to arrive at a surgical plan.Keep in mind larger implants tend to have
more problems over the years.Since
silicone implants wrinkle less than saline implants, they might be your best
bet.You can also approximate this at
home by measuring out an equivalent amount of rice placed into a cutoff foot of
old panty-hose, and put this in your bra.Wear this around the house for a while, and see what you think.Implant size must square with assessments of
tissue cover, breast diameter, and chest wall width.
Multiple measurements of your chest wall are taken (seven in total). Implant size selection has been an issue of
much discussion. Therefore, I use a wide variety of methods, but the implant size is
always established preoperatively.Also,
patients are advised to bring reference photos demonstrating their ideal size
and shape. A photo album of patient pictures is maintained to assist them.
These photos ultimately help in determining where the implants will be placed,
since they can be shifted inside (to provide more cleavage), to the outside, up
or superiorly, and down or inferiorly during surgery. In determining the final
size selection, I always place the highest priority on the preoperative
measurements and potential tissue cover. Then, the patient’s verbal requests
are factored into the analysis.Our
average size over the last 6,000 implants was 350. All the best with your size choice, "Dr. Joe"

It depends on what your idea of a small C cup is.  You should look at photos from the surgeon at the time of your consult.  That size seems a little small to me. I would probably go with 300 cc implants.

Hello,This is one of the most common questions on RealSelf.com regarding breast augmentation.  Even if you provided photographs, it would be impossible to predict what cup size you'll have with any given implant volume. I tell this to women who come in for a consultation as well.  The bra cup size 'system' is not standardized or predictable, so it's best not to use that as a measure of how much augmentation one is looking for. I agree with Drs. Tholen and Corbin.  Show your doctor in the office what sizer gives you the appearance you desire, and he will determine what implant will get you close to that.  Best of luck!