Would 400cc or 500cc be a natural looking implant for me?

Three dimensional imaging is very helpful in choosing a size which you think looks natural on you. You can visualize your own body in three dimensions with the implant size and shape which you are considering.

Sizing of breast
implants is a very individualized
process. Essentially, you need to custom fit the implants to your body.
In order to properly size implants, you need measurements of several key

items. Regardless of what manufacturer of implant your surgeon uses,
they all have what is called dimensional fitting systems. These systems
basically take some measurements of your breast width, height, and
tissue stretch to determine the optimal volume for your particular
tissues. i.e. What can your tissues handle? That is the "science" of
determining the optimal size implant for your tissues. The artistry with
your surgeon comes in taking the ideal size and working with some
judgement to get you as close as possible to your desired outcome. So
someone 5'9" 145 lbs with
3 children vs. someone with no children may have different optimal
volumes due to the differential stretch in their tissues. You can
Google
"High Five Augmentation" to get a quick idea of the process. Without those measurements I mentioned, it is difficult to give you any accurate information about 400 vs 500 cc. Good luck.

but maybe not too large for someone 5'9" tall.  Although I do not personally use the Vectra system, my understanding is that it is fairly accurate in determining implant sizes.  The final implant size chosen ultimately depends on your goals and tissue characteristics, neither of which we can assess without you stating your goals and providing photos.  Good luck!

I would agree with Dr. Pousti regarding the issue of the size. It will take in person consultation and examination to recommend the best size. Please see your surgeon for more discussion and to make sure that your surgeon understand your expectations.

Thank you for the question. In regards to specific size/profile of breast implant, despite good intentions, online consultants will not be able to provide you with  meaningful specific advice.  Careful measurements, dimensional planning, and careful communication will be key.
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're looking for. Ask to see lots of examples of his/her work. 2.  Again, have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining which operation and/or 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. I have found that the use of words such as “natural” or "C or D cup" etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup  size may also be inaccurate.  The use of computer imaging may be very helpful during this communication phase.
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.
I hope this, and the attached link, helps

500 cc breast implants are quite large and you're correct to be concerned about sagging and looking unnatural.  NextI suggest that you revisit your plastic surgeon and express your concerns and hopefully undergo a breast implant sizing system evaluation.It is very important for you to make the proper decision before you have surgery.  For more information on choosing the size of breast implants please read the following link: