I have 475cc saline implants. Is it possible to double the size? (photo)

Technically, yes, implants twice what you have can be crammed in behind your breast. this may not be wise since they will thin your own tissue and sag over time. Big breasts sitting on your lap don't look good.

Implants are 3 dimensional structures. If you increase the implants by 100% the actual projection anteriorly will only increase by 25%. Also, 475 cc implants weigh 1 lb each and doubling the size they will weigh 2 lbs each. You had a lift which means your breasts were hanging to begin with. I believe this would be a mistake. An alternative to consider is fat transfer. At 5'3 and 149 lbs, your BMI is 26.5 and you should have adequate site for fat transfer.

Best Wishes,

Gary Horndeski, M.D.

Dear tonya4033,
breast implant type and sizing selection is a complicated process and requires a detailed consultation that includes a discussion of your goals, a detailed examination, and a lengthy discussion. But the decision will always start and end with the patient. When it comes to sizing, we have all of our patients find 3 photos of their desired breast size. We ask for naked breast photos because clothing can obscure the true size (push up bras). Next, we consult with patients and go over the photos and take detailed breast measurements during a physical exam. Next, we using a sizing algorithm to determine a range of implants that will work based on the exam and the measurements.Lastly, during the operation, we use silicone sizers in the operating room to see how the size actually looks in the breast. We sit the patient up in the operating room, while asleep of course, and compare the sizer result with their desired look photos. If it is too small, we start the process over with a slightly larger implant. We don't stop until we get the perfect match.Of all of my breast augmentation patients, every one of them has been happy with their size due to this detailed and meticulous process. You don't want to invest time and money into a result that is either too big or too small.You should discuss your concerns with a board-certified plastic surgeon and make sure that your surgeon understands your goals.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery