There really isn't a set growth rate. It depends partly on how much/how often they are fed, and also varies from one snake to the next even if they are on the same feeding schedule.
One thing to look for is a triangular shape... pointy at the top and wider at the bottom. BPs should be more round in shape. If they are pointy on top, or even worse if the spine is protuding, then they are under weight.
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