Cute pics! She looks fine to me. Some bullies are just smaller build than others. And if her ribs a prodruding grossly than that is when I would say there's a problem, but like I said, she looks great to me. And I would assume that if there were growth issues, other things would be noticed...extreme fatique from lack of nutrients, maybe aches and pains from bone growth issues, etc. This is all just a guess. How does she act? Does she seem pretty healthy otherwise? I'm sure you have nothing to worry about, but if you do, I'm sure someone on here will know more than me and be able to help you.