Now is 136 grams small for a year old? Yes but since he was only fed mice fuzzy every week or every other week it was basically being underfed fed. Out of the eggs they can take a hopper and quickly move to adults, fuzzies are not for BP.
Now the only thing you can do is get him on the right track and as far as charts well there is no chart because every BP grow at a different rate, weight differs based on weight when hatching, how fast the animal is started, feeding frequency, prey size, skipped meal etc,so weight can very well vary from double to even triple between individuals of the same age.
Weight is a number what matters is that the animal is healthy, looks good (well proportionate and not emaciated) and is fed adequately.
For young animals hatchling and juvies feed a prey equal the animals girth size once or twice a week, as they get older and their metabolism slows down and an adult male will not require anything larger than a 75 grams rats and a female will not require anything larger than a 150 grams rats once a week.
Feeding smaller preys will also allow those adult to feed with consistency.
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