My surgeon said not to sit for three months after BBL. I can’t possibly put life on pause that long. Is this accurate?

BBL's are a fat transferring procedure and results of a fat transfer rely heavily on the recovery process during which time you are protecting the transferred cells while they reestablish a blood supply in their new "home". The pressure of sitting on transferred fat cells could result in the cells dying and compromise the results of the surgery and for this reason we recommend that our patients do not sit or lay on their BBL for 6 weeks post op, but rather use BBL pillows to sit (when necessary) and laying on your stomach to sleep.   
Following your post-op instructions (such wearing the proper garments, using the BBL pillow, regular but not strenuous movement, no smoking, etc) is important because these guidelines will help to protect the transferred cells and promote oxygen and blood flow to the treated area which will result in the survival of more fat cells and essentially better BBL results. 
You should have thorough conversations with your board certified plastic surgeon before and after your surgery to make sure all of your questions and concerns have been addressed. 

Every surgeon has a different recovery protocol so it is best to talk
with your plastic surgeon about what he/she recommends for you. With
that said, short answer is 8 weeks. I advise my patients not to sit on
their rear ends at all for the first week, this includes driving. After
then they may sit for short periods of time with a pillow under your
legs above the knee for 8 weeks, it doesn't have to be a special BBL
pillow if you don't want to draw attention to it. I would not recommend
sitting normally without a pillow or sleeping on your back/butt for 8
weeks. 
Kamran Azad, MD, Board Certified Plastic Surgeon@kamranazadmd