Well, I have a 4 month old that currently weighs in at 392 grams. He is pounding small f/t rats. I also have an under fed 2 or 3 year old that only weighs in at 206 grams. This one is a rescue and I am working on getting some meat on it's bones. The growth will really depend on what you are feeding and how often you are feeding. All snakes grow at different rates. You should get a scale and keep track of your baby bp's weight.