Will 325cc or 345cc give me the "natural" look, although I realize there is no "cup" size. I want full B/small C

Thank you for the question. There is no accurate/reliable/predictable correlation between size/profile breast implant utilized and cup size achieved. Online consultants will not be able to provide you with specific enough advice to be truly helpful. Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, in bra sizers, and computer imaging) as well as careful measurements (dimensional planning) will be critical.Given that your surgery is coming up soon, I would suggest that you spend additional time communicating your goals/concerns directly with your plastic surgeon, preferably prior to the date of surgery.Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery ( regarding breast implant size/profile selection) is:

1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. For example, I have found that the use of know words such as “natural” or "full B, small C cup” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate. Again, the use of computer imaging has been very helpful during the communication process, in our practice.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery, after the use of temporary intraoperative sizers.I hope this (and the attached link, dedicated to breast augmentation surgery concerns) helps. Best wishes for an outcome that you will be very pleased with.

Thank you for your question.  The right amount to increase cup sizes varies from patient to patient and honestly, there will be almost no significant difference between the two sizes you have chosen. Twenty cc is a very small amount.  I counsel patients that if there are trying to decide between two sizes to go towards the bigger one.  Patients usually wish they went a little bigger, and rarely wish they went smaller.  All the best, 

At your petite size, you will most likely have a C cup with either one of those 2 implant choices.  I noticed that you are selecting a round implant.  You state that you want a very natural look.  Shaped implants generally give a more natural look.  That is not to say that you will not look good with round implants.  You might see about actually trying on implants in a sports bra to see what they actually look like on your body.  As you probably know, examination and discussion in person is usually  best bet.  I hope this helps.  Best of luck!