Here's ROUGHLY what I do: http://ball-pythons.net/gallery/file...ging_chart.jpg

Here's a comparison table of rat and mice sizes: http://www.repticzone.net/images/25454/sizechart.jpg

the rat pinkies are really rat fuzzies which are the size of mouse weanlings. I would feed them mouse weanlings every 5 days until they are about 150g. Then you can feed them adult mice until they are about 300g-400g. Then feed them jumbos until they are about 600g or so. Then they should be able to eat small rats. Once they hit the 500-600g mark, feed them once a week instead of every 5 days.