What size rat to feed?

[CA cowgirl]

I got 3 new girls, 1 boy all alittle over 330g. They are eating rat pup now, can I move them up to a weaner?

Here's what I suggest...

Whichever of them are eating their food:

• with enthusiasm each time you offer it; and
• they've had about half a dozen straight meals w/o refusals

then you probably would be well off bumping up their prey size. *Edit: I realize you say these animals are new to you, right? I'd keep the next several meals as rat pups, just to be safe. Perhaps offer them at 5-7 day intervals to get things moving along and ensure they have plenty of food. /edit

Generally a good rule of thumb for bps is to offer them prey that is 10-15% of their body weight. Slightly more or slightly less can be okay too. Just be cautious with feeding live prey that is larger than the snake is accustomed to and supervise the feeding to make sure the rat doesn't take a bite out of your snake(s).

Here's Rodent Pro's sizing guide for rats... link... and the weaned rats sound good!