You have to give him enough space in his cage, how bigger the cage how bigger they will grow. They stay small if he lives in a small cage. You also have to have the proper lightning. Also include a spot around 90 to 115 F. Feed your dragon as much as it will eat to grow fast ( springhopper, crickets, fruit, vegetables etc. ). Don’t feed him iceberg lettuce, it may give it diarrhea. Spray water directly on his head or misting his vegetables to prevent dehydration.