First you say its a baby BP, so Im assuming a hatchling or close to it, so definitely give it a small mouse hopper for its first meal if thats the case not an adult mouce. I always try to start my hatchlings on rat fuzz or rat pups because I breed my own rats and I dont want my BP's to be mouse eaters. However alot of hatchlings will only start eating mouse hoppers so after about 2 meals I start offerong rat pups first until they eventually take them.