No magic number exists; you PS's recommendations for sitting after a BBL are the most informed you can obtain.I recommend that my patients minimize sitting, even with a pillow, for the first two weeks. If they must sit, every 30 minutes or an hour, they should get up and stand for a few seconds to take the pressure off. This reduces the chance for fat necrosis. I usually recommend about 6 weeks before sitting without a pillow. After 6 weeks the fat has revascularized, and they will have a very good idea of their final results. The Brazilian buttlift results that are obtained after 3 months are permanent if the body weight and body fat percentage are held stable. This is dependent upon the amount of fat transferred, the way in which the procedure is performed, and the way the patient is managed in the postoperative period. In most cases of weight loss, the buttocks and other areas with stored fat will become smaller. About 50% of the fat that is transferred lives and becomes a part of you. This will hold stable as long as there is no weight fluctuation. The fat will not move, but losses in weight will distribute differently. The fat that lives in the buttocks from the procedure will get larger with weight gain and smaller with weight loss. Kenneth Hughes, MD, Board Certified Plastic Surgeon Los Angeles, CA