I have snakes that are 1 year old that have passed up my 4 year old Ghost BP in weight. He is a pretty consistant eater but has always been on the small side - he is about 900 grams now and looks healthy but just small for his age compared to my other bps.

I guess no two are exactly alike in growth, personality!!!

In regards to the parasites - my thought is that if his poop is firm (not runny) then it is highly unlikely that he has internal parasites. But, to settle your mind - just take his next pooper into the vet for a fecal float to make sure - this usually runs about $40.

Good Luck.