My Duffy was. The stuffing in his arms was totally flat and the stuffing in his tummy was getting flat as well. Was at the point some of his pants were too big for him in the waist and I had to tuck them with a safety pin. Duffy was not happy and said he wanted to be fat.
Well, last week, I took Duffy to my local Build A Bear and asked if they could open him up and add more stuffing. I was a little skeptical because they wouldn't even touch his foot when the stitch popped a couple years ago, but one of Duffy's "cousins" on Twitter had it done at their BAB with success, so I figured I'd give it a shot. Worst they could do is say no and I'd just wait for my aunt to get back to her sewing. I asked and they said sure! The store wasn't busy so they got his back opened and I helped add more stuffing to him to make him nice and fat. They even did a good job sewing him back up! Duffy is quite happy, though some of his clothes fit a little tight now.
Oh and when I asked how much... they said no charge and said if he ever needs more stuffing again or if any of my other stuffed friends need some extra fluff to bring them by!