Re: Underweight/stunted BP?
Honestly, a nearly 17% increase in weight in only 2 months for a snake that is adult age sounds like a solid amount of growth assuming it is just filling out from being skinny or gaining some length and not just packing on a ton of fat. (I didn't see pictures, so I can't judge one way or the other.)
Keep an eye on body condition to make sure it doesn't become the fat packing on instead down the road. Most adult males, especially pets, are perfectly fine eating small rats every 2 weeks, so once he is at a good body condition, it may be good to move back to that schedule. I know males up to 2,000g are generally fine with small rats, and my 1,400g male is perfectly fine with ~60g rats every 2 weeks, so I highly doubt yours will ever be big enough to need medium rats. Additionally, weight should be gained slowly in reptiles and the more frequent small rats should be plenty there
Some adult males are simply small and he may be one of them. 700-900g is not what I'd call a stunted size for a male BP, especially at a shorter length, though there are plenty who do grow larger than that.
If you said he was a 18-24" BP weighing 300-350g at adult age, and did not grow much at all when fed more appropriately than a prior owner did, then that's what I'd call stunted. Usually stunting is defined to be an abnormally small size that is not correctable by changes to the diet that would otherwise result in growth.
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