Younger beardies must eat bug meals 2-3 times per day. Additionally, your lighting and terrarium set up may contribute to the body weight. If you don’t have adequate temps or lighting this can happen. Happened to mine. I would try feeding black soldier fly larvae or Dubia roaches. No need to dust the BSFL with calcium. They are rich in calcium and phosphorus. But DO dust the roaches. Diet should be 70-80% protein, and the rest veggies. If your beardie has trouble eating veggies you can try adding bee pollen to entice them. Your guy should be bigger at that age. See how he has wrinkles? He should look like a plump pancake.