64 grams is the average weight of an hatchling out of the egg, now for the rest there is no average at 3 months or older because it will essentially depends on a few things.
Weight out of the egg.
Type of prey started on out of the egg if the animal is very small under the average of 50/70 grams out of the egg the prey will obviously be smaller than they usual hopper.
How fast the animal get started out of the egg some will eat the next day after their first shed some will take 6 to 8 weeks.
Feeding frequency and prey size thereafter.
At 64 grams your BP was either not well started or was very small out of the egg. I assume you have no feeding records from the breeder?
This is not a problem so long the animal eats for you.
Stop focusing on weight and focus on overall body proportion instead once the animal catches up.
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