The average size for a beardie at that age can be from 100 to 300 grams, you can't really compare dragons with different genetics, metabolisms and environments. Some of my biggest, fattest dragons were slow growers and grew more during the second year than the first (I call them 2nd year dragons). This reminds me of a study I found, the scientist studied clutches of babies in the wild for several years in australia. It concluded that bearded dragon clutches are all made up of fast growing to slow growing babies in order to insure survival of the bloodlines. The fast growing offspring bred earlier, but died sooner, only making it through the next season. The slower growers were more drought hearty, but didn't breed until the following season and survived much longer in the wild. This helped them get through more drastic weather conditions, colder winters and hotter summers. In my own personal experience, I have found that the slower growers tend to be calmer, less stressed dragons who have stronger immune systems and resist parasites much better. Being a breeder, I usually get stuck with the slower growers longer or end up keeping them to breed later. My dragon's have a reputation for being extremely sweet and personable, I mean who doesn't adore a cuddly dragon? Regardless, don't worry if you have a smaller sized dragon, it doesn't mean anything is wrong at all. Their metabolisms are slow and steady in the beginning, then most end up being amazingly beautiful, fat and healthy later.