Thank you for your question.Over the first 4-6 months your swelling will start to resolve and your body will change. The size of your buttocks may reduce in size slightly when most of the swelling has resolved and the surviving fat has stabilized. At about 6 months is when you will start to see your final result. Best of luck in your recovery!
James Fernau, MD, FACS
Board Certified ENT
Board Certified Plastic Surgery
Member of ASPS, ASAPS, ISAPS, The Rhinoplasty Society, AAFPRS, OTO/HNS, ASLMS, International Federation for Adipose Therapeutics & Science
Fat graft is maximized by using the correct instruments, reduced pressure harvesting and time fat is out of the body with low pressure centrifugation and reduction of post-op swelling and exposure to toxins such as carbon dioxide and cyanide from smoke and other chemicals from hair and cosmetic products. Fat is living tissue and placed in small droplets gets its nutrition by diffusion for 2 weeks followed by neo-vascularization (which is why we tell patients to reduce salt and water intake, increase protein intake, minimize activity and sitting to reduce swelling). Early swelling is 2 weeks when patients can sit and residual is 6 weeks when patients continue to shape in the garment. It takes 6 weeks for scar tissue to develop to help the donor site as well.
How long after BBL before the fat has taken and no longer dissipates?
Fat volume can decrease all the way to 6 months, but most of the lost volume occurs early before the 3 month mark. Also, if you lose weight or increase your exercise regimen post op, then your volume can go down.