Well no wonder, mouse fuzzies are colubrids food even out of the egg they take something much bigger, rat crawler or hopper mice.
Basically at this point your BP utilize the entire prey (which is way too small) for growth leaving nothing to be eliminated.
Start feeding the appropriate size prey equal the girth size until your BP reaches 500 grams and your BP will start to grow, shed and defecate.
Sent from my SM-G900V using Tapatalk