5'1" 450cc silicone too big?

Hello and thank you for your question.   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.  This entire surgery
can be performed with a small incision technique.  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.
Harvard-trained plastic surgeon

Thank you for your question and I can understand your apprehension.  Unfortunately without a full series of photographs and a discussion as to your goal look, it is impossible to make an implant recommendation.  There is unfortunately no correlation between cc size and eventual bra cup size.  As a result it is important to be able to communicate what shape and size you'd like to obtain and your plastic surgeon can help you select an implant from there.  Ultimately you should go with the surgeon with whom you feel most comfortable in asking questions as they should be providing you with the reassurance on your choice. Hope this helps.