Am Currently 120 Pounds with 450cc Submuscular Silicone, Infram Implants. Would It Be Okay to Increase This to 650cc Eventually?

Many women who have breast augmentation face what you are going through right now.  I call this the "psychological cycle of the implant" and it takes some time to go through it completely. Initially, the implants sit up high on the chest (especially those placed under the muscle). A woman wakes up from surgery and second guesses the decision to have breast augmentation, sometimes even feeling the surgeon went too large. Then over the next few weeks to month, the  implants settle a bit. During this time, the patient gets used to seeing the implants in  a larger appearing higher position. When the implants settle, the reaction becomes one of minor disappointment and questioning of "did I go big enough" or wanting to increase the size. Then, after a little more time (several weeks to month), the patient again "gets used" to the size and shape of the implant and now realizes (hopefully) that the surgeon did indeed choose the right size for her body.  Hopefully, that happiness continues and no further surgery is desired. So I would give it at least 2-3 months from surgery to give yourself the chance to make it through the psychological cycle of the implant.  Good luck. 

   6 weeks following breast augmentation, you should continue to heal for at least 3 to 6 months.  Going up 200 cc may be reasonable based upon chest wall measurements, but you should understand the associated risks with larger implants.  Kenneth Hughes, MD Los Angeles, CA

There is absolutely no limit to how big you can make a breast.  The problem is that you increase the risks of complications related to stretch deformities. If you like the shape you have then be satisfied that your surgeon did a fine job and you look great.