I have had exactly 0 patients that have said that their breasts or buttocks are too large after one session of fat grafting. More often, a second grafting procedure is used to add even more size to the areas desired. If your breasts are small to begin with, there is only so much fat that can be successfully grafted in one session. Generally this will give you an increase of one cup size. If you want more, you will require a second grafting procedure.Planning should involve a thought process that considers which areas to take the fat from for the initial session, reducing those areas maximally, and leaving other areas in place for a second session if needed.