I just got my Lesser Yellow Belly ball python back in January. She seemed an okay size. She's going on 8 months now and I weighed her last week and she was 367, I think that's normal. I'm currently feeding her Adult Mice. I got her feeding log from the people at Repticon, and they said she had been eating frozen thawed rat weanlings. However she has refused to take one from me. She's a feisty feeder and never misses a meal on the mice, however she refuses to take a rat weanling from me which makes me think they had been force feeding her to make her bigger in time for the show. It's just speculation, but I've tried getting her up to rat weanlings because she's as big around as them now but she refuses.
I feed her adult mice twice a week if I can.