Hello dear!!Thanks for the question and provided information as well. Unfortunately, there is no way of gaining weight in a specific area of your body. 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 :)
There´s no way you can take something just to gain weight in you butt and hips. I do not recommend any companies or individuals promoting magical creams, potions, lotions and pills. It is not yet possible to take a substance that will only make your butt and hips grow.