Out of curiosity, what brand, model, and type (compact, coil, tube, or mercury vapor bulb) did you get him? How long did he go without a UVB? The reason I'm asking is I want to make sure you got an adequate
UVB light for a bearded dragon, most people do not buy a good one on their first try, and the
UVB light is the most critical item you will ever buy your bearded dragon, and its quality and strength of UVB will determine whether he can make vitamin D3, absorb any nutrients, including any Calcium you're giving him, whether he will grow, and whether he will develop bone density issues like MBD, as well as numerous other health problems and illnesses. So better you get it sorted out now when he's young, because they do their most growing and developing in their first year of life.