I don't think my bp is gaining proper weight

[Egapal]

It won't grow fast on 3 mice a month, but if I read the OP's post correctly, they offers food more often but the snake only eats about 3 times a month. An adult mouse should weigh around 20-30g, which means the snake should still be bigger than it is. There might not be anything wrong and it could be directly related to it's feeding schedule, but it's also possible there is something else going on. Fecal exams aren't that expensive and it's better safe than sorry.

Suggesting a fecal with this much info is crazy. The OP says he got the snake at 3 months old its now 6-7 and later he says 8. Well you don't know how hold it was when you got it but you should be able to tell us how long you have had the snake. Lets say 4 months as the average. You said it eats 3 times a month. That's 12 feedings and in that 12 feedings the snake has gained 70 grams. Now my BP retained 50% of his prey weight as actual weight gained. I would suspect the OP's would retain less as its going longer between feedings. But lets assume 50% retained. That places the total rodent weight consumed around 140 grams. That's an average of about 12 grams a mouse. I have no problem believing that the OP is feeding a 12 gram mouse 3 times a month. There are tons of people who come on this site saying exactly the same thing. The OP never said "adult" mouse.

I echo the other good advice given so far. Feed an adult mouse every 5 days. Other people are feeding rodents twice as big (assuming my 12 gram estimate is correct) twice as often. So basically if you feed your snake 4 times what you are feeding it now it will grow faster. Don't bother with a fecal till you have some actual numbers that you can give to a good herp vet.