I have read that allot of ppl do not feed their baby beardies enough the first year. That could be his problem....that he was underfed to begin with. I would feed him his greens everyday....even if he doesn't eat them...offer them. Cut them up in bite size pieces and sprinkle calcium on it. Then for now till his weight gets a little more offer him protien a couple times a day. Typically when they are adults...it shoud be 80% greens and 20% protien. At least that is what I have read....but if he is a little skinny....it can't hurt to offer more.