I Am 5'1 105lbs, Will 355cc Implant Be Too Big for Me?

It is difficult to advise you without more information as noted by the other members of this panel. This sounds big in a 5'1" 105 woman but this depends on your anatomy and your measurements/dimensions. There is no way to advise you without more information. I highly recommend that you see a board certified plastic surgeon with a good amount of experience and reputation with a Vectra 3D imaging system. It will give you some good visual feedback. Best of luck. 

It is best to pick the implant that fits your body.  A HP 355 will be narrower than a LP 355.  Check the rough base width diameter of your breast and pick the size that fits.

There's really a lot that goes into the selection of a breast. This includes, size, breast/chest dimensions, stretchability of skin, breast shape, and nipple position. Add to this a woman's specific goals and what she thinks looks good and you have a lot of combinations that are possible. I would guess that your body could handle 355cc but I couldn't possibly tell you if that would give you the result that you want. Get some consults with some Plastic surgeons whose results you like. Ask questions and take your time. Choose the doc that makes you feel most comfortable and who makes the most sense to you. Good luck. 

   The average breast implant placed in the US is about 350 cc.  A 355 cc implant in the right profile will fit almost anyone's chest wall width.  I would recommend that you try on the sizers prior to surgery to get a better idea.  Find the surgeon with ELITE credentials for surgery who performs hundreds of breast augmentations a year.

To determine the right implants for you, it is important to go for a consultation and have a thorough exam and discuss your goals.