There is no weight/height requirement for a Brazilian Butt Lift, but you will need a sufficient amount of fat on your body to be removed (by liposuction) and injected into the buttocks (fat grafting).Without knowing more details about your BBL goal and an examination to see where we can harvest the fat, it is hard to answer your question. I have successfully performed BBL on patients who did not think they had enough fat to get the results they were looking for without gaining weight.I know that many doctors advocate gaining weight, but this will only help if you are willing to keep it on. Remember that maintaining your weight in a comfortable range is key to keeping your results stable, whether you have a BBL or just liposuction.I recommend that you consult with a board-certified plastic surgeon who has a lot experience performing Brazilian Butt Lifts. Make sure you get to look at their photos and see that they have been successful with others of similar build.Good luck!