Just wondering about the progression of some peoples ball pythons.

I have 0.2 females born sept 2nd/2011 so they are coming up on 2 years this september. Both are hovering around the 600-650 gram mark.
I've been keeping snakes for 8 years now, I don't remember my first few ball pythons growing so slowly.

Im starting to think the rats I'm getting are sub par or something.