What is the minimum weight a BBL can be cleared for? I am 4’11 and 118 pounds.

There is no absolute minimum weight for undergoing surgery.Patients interested in BBL often ask questions of the necessary volume for transfer. Ultimately, the answer is two pronged and based upon both patient expectations and the nature of fat graft themselves.
BBL and fat transfer is ultimately dependent upon the long term viability of the fat grafted. That being said the resorption rates of fat transferred can be significant. Clinically this translates to a progressive loss of grafted volume in the months following the procedure.
I tell patients that they can expect resorption or graft loss on the order of 50% (at most; prepare for the worst and hope for significantly better). Additionally some harvest volume is lost in processing the fat graft prior to transfer. Thus I generally recommend that patients seeking even the most minimal volume increase have adequate reserves for grafting of 500 cc per cheek (at minimum).  This means that harvest will usually exceed 1 liter (assuming for processing loss).
However, it important to remember that these are recommendations and can be amended based upon a patient's particular expectations. Some patients only want a subtle change and may be willing to accept a less significant result. But the rule still applies you have to have the fat to transfer the fat.
With regards to your specific question, it is difficult to comment on candidacy without photos. However, at your height and weight it is unlikely that you will have significant reserves for transfer. The best candidates are healthy and have reached a healthy stable weight (preferably with a BMI < 30).
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Hello dear!
Thanks for the provided information.
There is no minimum weight for a BBL. In general, you need to be physically healthy and at a stable weight, have realistic expectations, non-smoker and your BMI needs to be 30 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)