Will 310cc breast implants look larger or smaller on a person with a small frame (rather than a large frame)?

You are correct that the appearance of a particular implant volume will be different depending on the existing body dimensions of the patient. I have treated small-framed patients for whom a 300 cc implant looks quite large, and other patients (such as a 6 foot tall, 175 pound woman with broad shoulders) with larger frames for whom implants of 600cc, 700cc or even larger don't look unnaturally large. Since you are 5'4" and weigh only 100 lbs, with very little breast tissue, a 310 cc implant will likely make a huge difference on your body. Ultimately, it's the responsibility of your surgeon to guide you when determining implant sizes, since you aren't really in a position to make that decision completely on your own. Good luck!

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  It would be helpful to include pictures of your breasts.  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. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon