every snake is different, I've seen babies eat the same size, and number of prey items and grow twice as fast as their clutch mates. As long as the snake isn't looking thin but has good weight then your golden.. I have 2006 animals that weigh 950 grams and I have 2006 animals that weigh 2200 grams. I have 2009 animals that weigh 1500 grams and snakes that are 2 months younger than them that don't weigh half that..I guess what I'm saying is there is no set growth rate..