5'3", 118 lbs 34A. PS suggests 275cc moderate plus. Good size?

A plastic surgeon who has examined your natural breasts, measured your chest and breast diameter and listened to your goals can provide the best recommendation about breast implant size and profile. Your plastic surgeon has likely done many breast augmentations and has the training in both technique and aesthetics and the expertise to suggest the best breast implant to fit with your natural shape and create the look you want. Since you have concerns, you may want to see a second or third plastic surgeon and compare recommendations to make the best choice for you.

Thanks for the question. I recommend you to send your photos to us to give you the advices you need and want.Kind regards 

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.  
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

Thank you for sharing your question.  Unfortunately without an in-depth verbal and visual description of your goal results, as well as measurement of key breast parameters, it is difficult to offer definite implant recommendations.  Most patients benefit from "trying on" different implant sizers to have the best idea as to what their results will be, while their surgeon supplies appropriate guidance based on your anatomic limitations.  Best wishes

Thank you for your question. "Tissue based planning" relies on your chest and breast measurements and is the safest way to ensure good long term results. Your surgeon should determine what size and projection are necessary to give you your desired result based on your body's measurements. The best way to assess and give true advice would be an in-person exam. Please see a board-certified plastic surgeon that specializes in aesthetic breast surgery. Hope this helps and good luck with your surgery.