As yodawagon said, it depends on the snake and prey. If you are weighing the snake and prey, it should be around 10-15% of the snakes body weight. If you're going by size, the diameter of the prey should be close to that of your snake, or maybe a tad larger... so that it gives a light bulge in the snakes belly. Not too much. If you're feeding prey around this size/weight, I would not feed any more often than every 5 days. Maybe that's just me... but I think that is plenty to keep a healthy snake.
Then again, if your "baby" is 300 grams, and you're feeding it a fuzzy mouse, it's going to be hungry all the time as that isn't sufficient food for the snakes size.
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