I am 5'5 130 pounds and a 34A. My doctor recommended 500cc and high profile because the chest muscle will squish the implant down to a 400cc, which is the sizer I was trying on was about 350-400cc. I also have a narrow chest and she recommended high profile. I told her I did not want anything too huge for my body frame, maybe a full natural C cup, and 500cc seems like so much! Does the chest muscle really squish it down that much? Now I am undecided if I should go smaller or not….