5'1", 105 lbs. Which implant size best fits me?

Breast implant size is determined on several variables including Breast base width, skin quality, patient desires, sizing, etc.  "Natural " looking Breast is unlikely with disportionately large implants.  Everyone's anatomy is unique, but in general much smaller implants would look more "natural".

Hi MelissaDawn2392 and thank you for your question.  I think it is important to remember that the most appropriate implant for any patient will be largely determined by the patients pre-operative anatomy, native soft tissue quality, and desired result.  It is essential that there is a thorough discussion of the patients ultimate cosmetic goal and any anatomical limitations that exist in achieving it.  From what you describe a 525 and 575cc implant does seem quite large but without seeing you in person it is difficult to recommend a specific implant size and profile to best achieve the fullness that you are aiming for.  To help patients get a good and realistic idea of what various implants would look like on them, I offer 3D imaging using the Vectra imaging system at the time of a patients consultation and/or pre-operative appointments.  If you did not try this, or if the technology was not available, you might want to consider consulting with a board certified plastic surgeon who offers this to his/her patients.  I hope that you find this helpful and I wish you all of the best.

Thanks for the question. Based on the information you provided to us I think that a volume between 450-500cc, silicone implants, placing them under the muscle, will give great results, fully breast with natural apperance. I recommend you a board certified surgeon. Kind regards 

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  525-575cc is a large implant.  The size, profile, and shape of the
implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon

Without a photo, it is impossible to give an accurate response but that size implant is a bit large for someone of your height and weight. You will be considerably larger than a C cup with that size implant. It is always a good idea to get a second opinion. Best of luck.

Hi.. thank you for the question, without a picture is to difficult to give a specific opinion, but there are some 3D softwares that can make virtual simulations, to give the patient an idea of the results. 

Patients often think in terms of cup size when considering augmentation. Unfortunately, devices are sized in terms of milliliters (cc) of volume. This can lead to some confusion when sizing. Additionally, it is important to remember that cup size itself is not standardized with variations from one manufacturer to another. Unfortunately, as many women can attest their cup size in an industry leader such as VS is not necessarily transferable to another brand.
Another point which is often under appreciated is that of anatomy and starting point. Any implant will add volume to the volume which is already present. The implant is additive. A particular volume will not necessarily confer the same cup size to different patients (often times it will not even confer the same cup size to different breasts in the same individual...remember they are "sisters" not "twins"). 
A general rule of thumb is that 125cc can represent somewhere between 1/2 to a full cup size increase. Smaller volume differentials (25-50cc) are typically less consequential representing a volume change of less than a shot glass. However, I have found these numbers, at least anecdotally, to be of little help. Patients often present with notions/goals which do not correlate with these sorts of sterile volumetric assessments.
When sizing patients, there are a number of useful tools including:
-3D imaging (has the added benefit of offering a volumetric analysis of the pre-operative breast)
-Breast sizers (rice bags)
-Goal photos
I also recommend that patients commit to a particular look rather than a cup size. Once a patient settles on a look that pleases them the overall cup size increase becomes less relevant.The key to obtaining a natural result is to stay within the parameters defined by your BWD. This will ensure that you avoid the dreaded "fake" look. 
When pursuing a "natural look" I remind patients that a breast is composed of fat/adipose and glandular tissue. With that in mind, patients who are very thin with very little body fat do not normally have large breasts. A 500 cc implant on a small frame can yield a satisfying result (although I am doubtful. However, your instinct are correct...it will never be "natural."
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Thanks for your question. While every plastic surgeon will want to help you realistically achieve your goals, in many cases bigger is not always better. Large implants thin the skin over time, drop more over time and can lead to long term problems. Given your stats 525 and 575 are really large numbers unless your chest is very broad and you have a lot of natural breast tissue already.When in doubt get a few opinions-- often the best options will become clear. I have included a link below tat discusses how I approach sizing in my practice. I hope it helps.

Thank you for your question. The breast implant size that is right for you will depend on your individual anatomy, skin quality, and amount of change desired. If your goal is to have natural-looking results, it is generally advised to go with smaller implants. I think that that size may be very large, but I have not examined the patient.  Best of luck.

I appreciate the question, but would reserve any judgements on the implants you’ve chosen until I had more information in regards to your measurements. Implants are most commonly chosen based on your current anatomy and tailored to fit your needs. 525/575cc implants are large, but perhaps could still be “natural” depending on how they “fit” with your body. That said, at 5’1” and 105lbs you’re likely to have more of an “augmented look”. An in-person consultation would be best to further advise you. Best of luck.