Prime example I got a pastel male born Oct of 06. I got him in Dec he was 250 grams. He was being an A$$ and only ate 2 meals 1 in Jan and 1 in Feb. I got him back on feed and feeding him every 7 days a ex small rat he now taps the scale at 418 grams.. Hell be a breeder by Nov. My Spider is the king born Nov '06 and he at 387 as of this morning.. :D
Just be patient and they'll grow some faster than you would like.