So when we took our kitten to the vet he said that she was underweight. She is thirteen weeks old at this point. We're going to give worming treatment tomorrow so this part of the problem will at least be taken care of. But beyond this how do we help her gain weight? We switched foods and are giving her five meals of Royal Canin kitten food (this is what the vet wanted her on) each day. Will this problem fix itself or should we supplement her food with something else?