How Much Volume Will I Lose After BBL?

You can expect to lose about 30-40% of the volume of fat injected after a Brazilian buttock lift. This can vary based on technique, amount of fat injected, age of patient and other factors. You should avoid direct sitting after this procedure which will also help to preserve the volume of fat injected. It can take about three months before you know how much fat has actually survived.Best wishes,Dr.Bruno

In general most patients lose about 40% of the initial volume over time. The good news is that as you lose the buttock volume your liposuction areas will also become less swollen which enhances the curve between the two areas. Avoiding sitting on your buttocks will help prevent large losses in volume.

Hello dear!!
Thanks for the question and provided information as well. 
After a BBL, only about 70% of the transferred fat cells will survive, so it is normal to see a minor reduction in your buttocks. If you have any concerns, I suggest you to follow up close with your plastic surgeon.
Good luck :)