See Video: Your size should be based upon your base diameter and implant profile choice

You can likely go to a C cup, but the most important measurement your PS will need to take is the base diameter (check out the attached video!). Your PS should use this measurement with several others, as well as discuss with you your desires, in order to make a decision on a moderate plus or midrange profile implant for a moderate C, or a high profile implant for a full C. Most petite A cup women in my practice get high profile implants if/ when they suggest a desire to be a full C. Good luck!

A full C cup size is fine on almost anybody.  Cup size is relative to your body characteristics.  Since you are very petite, the implant that you would require to increase from an A cup to a C cup would be different than the implant that a 5'7" 130 pound woman would require to do the same.  The determination would be made in consultation with your board certified plastic surgeon, who would take measurements of your chest and ask you certain questions about what you wish to achieve with your surgery.  Personally, on many of my patients, I use devices called breast sizers along with the chest measurements and patient wishes, during the operation to help determine the appropriate size implant.  Breast sizers are one time use implant devices that can be filled after placement under the breast during the breast augmentation surgery to determine the appropriate sized permanent implant for the patient. 

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