Is there a chart somewhere here that shows the progression of rats? Like approx weights for them as they grow? My newest Cheddar is a year old, 450 gram bp. He's getting ready to shed so not feeding him just yet but it's coming and I need to be prepared. He'll be at 3 weeks with no food as the seller had fed him a week before I got him. Between that and getting his tank set up and waiting for a thermostat and him now going into shed, poor guy has got to be getting hungry.