The easy way to do it is to feed 10-15% of your snake's body weight. So your little 125 gram one would eat a mouse 12.5-19 grams, which equals a large hopper or regular weanling. If your fuzzies are 5-7 grams (which is typically where they'll be), then 3 of them would be appropriate.
The problem you run into is that not everyone calls a certain size the same thing, so it's best to weigh the food yourself. I made a list of average sizes based one several different rodent suppliers websites:
Mice:
Pinky 1-4 days 1-3 g.
Peach Fuzzy 5-9 days 4-5 g.
Fuzzy 10-13 days 5-7 g.
Hopper 14-19 days 8-13 g.
Weanling 20-25 days 14-18 g.
Adult 25-40 days 18-26 g.
XL Adult 41+ days 27+ g.
Rats:
Pinky 1-7 days 3-9 g.
Fuzzy 8-13 days 10-20 g.
Pups 14-20 days 21-30 g.
Weaned 21-25 days 31-45 g.
Small 26-32 days 46-85 g.
Medium 33-42 days 86-175 g.
Large 43-60 days 176-275 g.
XL 60+ days 276-376 g.
Reply With Quote