If you are asking concerning a particular dragon, size is not the best indicator of health. Moderate to high activity level, a constant or steadily rising weight, and the right ratio of feeders:veggies for his/her age are more indicative.
If you are concerned, keep a digital scale on hand to make sure your baby is growing!
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!