Hey,
I like to feed all my balls about 25% of there body weight once a week. When a snake is a baby, you need to feed a little less weight but if you want to grow your snake you need to feed once a week at least a meal that is suitable for their size. Once a snake is over 2000 grams I try and feed about a 150 to 200 gram rat once a week.
Good Luck,
Bill