All beardies grow at different rates, even babies within the same clutch can have huge differences in size. As long as he seems to be eating fine and is overall healthy I wouldn't worry too much about size.
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!