I would feed on a 5 day schedule until at least 6 months old! The snake will tell you because if it refuses then you know you have to go to a 6 or 7 day schedule. I would feed it at least a adult mouse every 5 days or even go to a rat pup. Rats come in larger sizes so that way you will only have to feed it one item instead of multiple! in a month or two, it will need two mice per feeding if not switched to rats. At 4 months it should be eating a larger item than a medium mouse so try a adult mouse next feeding then it won't be hungry still! Hope this helps!!! Good luck!