I am 5"1, 115 lbs, barely an A cup. I want to be a C cup, will 460cc HP Silicone under the muscle be too big?

There is no way to tell other than through a personal consult.  I find cup size is not very helpful to figuring out final desired breast size.  Look at my websites at the before and after pictures and you will see many women who's  afters are a much larger bra cup size then you would have guessed based on the pictures.  I find it is better to try on implants until they feel like the correct size and then the surgeon and patient will be on the same page for expected breast volume

Unfortunately, you have not told us your bra size just your
cup size. If you are 32 or 34 each 100
cc’s of implant corresponds to 1 cup size change. If you are 36 or 38 each 200 cc’s of implant
corresponds to 1 cup size change. From
this, you can compute the volume required to achieve your desired goal. 460 cc implants are large and if placed under
the muscle will extrude inferiorly and laterally requiring revision. I always recommend small round textured
silicone gel implants placed retro-pectoral since they look and feel more
natural, are more stable, less likely to ripple or have complications needing
revision. Implant profile is irrelevant
in the retro-pectoral position since the muscle compresses it. 22% of women who undergo breast augmentation
alone require revision within 2 years because they are dissatisfied with the result. Best Wishes,Gary Horndeski, M.D.

Hi Ashley,It is very hard to say without a physical evaluation or even a foto. That said 460cc is a  relatively big implants and should get you to your goal.  

Thank you for your question. It is not the size of the implants that matters most, but your chest wall, breast base measurement, tissue characteristics such as laxity, elasticity and tissue thickness. Anyone can shove a large implant under your breasts, but you have to discuss and consider the long term detrimental effect of a poorly thought out surgery on destroying your breasts and skin and end up a breast "cripple". Corrective surgery is always more expensive, involves more scars and less than ideal results. If your surgeon lets you be decision maker without proper counseling, please cut your losses now and see a board certified plastic surgeon for a proper evaluation. Right now your decision is reversible, after surgery it is not. BTW, do not expect to look "natural" with 460cc implants with your anatomy that you described. Good luck.

Only your doctor is in a position to tell you if this is an appropriate implant size based on your goals as expressed to him/ her as well as your dimensions and soft tissue characteristics.  I love 3D imaging to help me get a better idea of what "look" the patient is going for and to help her feel comfortable with the implant chosen.  For what it is worth, most patients of your height and weight would have an obviously implanted look and shape.  If you like the idea of a very rounded breast (likely a D+ cup) and have no problems with everyone you meet knowing they are implants you are probably on the right track.  If not, I would reconsider.  -York Yates MD, Utah.

Thank you for your question. It is much better to accurately discuss implant volume and projection with an in office exam and detailed measurements. In order to make an accurate size recommendation, I would need to assess your chest wall and breast mound measurements/characteristics. I use these measurements to help me during the sizing process to guide you to a safe result for your chest wall and just as important, one that meets your end desires.The next step is to try on this range of implants in the office with your doctor. The key to this success is showing your surgeon the body proportion you desire with a bra sizer and allowing your surgeon to guide you to the right implant. It will be much easier to communicate in implant cc's than cup size when determining the appropriate implant for you during the sizing process. In addition, review of photos and use of rice bags can be very helpful to the patient and surgeon in achieving a safe and happy result. Close intereaction and involvement from your surgeon during this process can help alleviate the anxiety and fears of choosing the right size. I wish you a safe recovery and fantastic result.Dr. Gill

You’re
absolutely right that some women look “ok” with a 460 cc implant while others
look “huge”.  Just like breast implants
come in several shapes, profiles and sizes so do women’s breasts and so the
same implant placed in one woman is not going to look exactly the same in
another woman.  This is why I recommend using your
breast base width to find an implant that will fit your body.  The width of your breast is an
important measurement to determine the range of implant sizes your body will
hold.  During a consultation, I have my
patient “try on” different implant sizes.  This allows me to visualize the additional volume that is needed to get
the desired look.  I highly recommend
meeting with your board certified plastic surgeon before surgery to confirm
your implant size.Be well and good luck!@norrisplastic

Breast Implants that are too large will result in an unnatural look and also will damage the tissue. In order to get an idea of a range of sizes that could work for you, look at many, many before and after breast augmentation photos. Look for women who have a starting point like you and a result that looks like what you are hoping to achieve. 

460 would be too large.  Although high profile implants allow narrow chested women to perhaps go a little larger than they might have been able to accomodate with moderate profile impmants, it is important not to push the envelope too far.  Implants that are too large definitely have higher complication and revision rates.  In addition they look unnatural.

My personal opinion is that a 460 cc implant is too large for your  body unless you really want everyone to know that you have had BA. My feeling is more in line with the esthetics of breast  surgery and balance between  the shoulders, breasts, waist and hips.  This size implant is out of proportion to the  size of your body. With such large implants, there  will be  little  doubt  from observers that you breasts are  augmented.I wish you well !