Quote Originally Posted by mattchibi View Post
I read somewhere last night you want it to be about 15% of the weight of your baby.

I am feeding my very small 3 year old girl BP rat pups at the moment, and they even seem big for her. Shes 30+ inches, not frail but definitely not big. Probably switching to small rats soon though)

I like using the width to measure. The prey should be between 1 to 1.5 times the width of your snake. Some people say 2 times the width but I think if its a new snake, you should take it easy until you actually get them feeding. Im no expert though!
Did you mean to say three year old bp. Rat pups seem really small for a three year old imo.