BBL BMI - do I have to gain more weight to have the second one done?

To make an assessment, we always need to see proper before and after pictures.
If you don’t have before, and after pictures and ask your surgeon to forward, the pictures they took.
We can’t go by weight alone.
It depends on what your fat distribution is.
Generally speaking for a second BBL, I often treat the previous area as a secondary Liposuction and Kan usually remove about 25% of what was removed the first time, but this depends.
I usually Add New areas like arms or thighs for the second fat transfer procedure.
I generally do not recommend people gain weight for the purpose of having fat transfer procedures.
Unless you plan on maintaining the increased weight, which makes people generally look and feel worse gaining weight weight is pointless.
Best,
Mats Hagstrom, MD