Hi, my ba is Monday feb 25. I'm really excited to finally do something for me.. I have breast fed/pumped for my 3 kids so I'm relatively deflated. At barely 34b I'm 5'6 and 118lbs. My rib cage measures at 29" and this whole breast width diameter thing is difficult to measure but I think I'm about 13.3-13.9cm. I'm having 450cc mentor silicone mod plus profile put under the muscle. The implant diameter is 13.6. I have read that it's recommended for the implant to have a diameter of about 1cm less than your own breast width... What's anyone's thought on this size?