first snake feeding questions

[rwg]

Hello,

I have a young corn snake, and this is my first reptile of any kind. I've read a lot of material on the internet, but I still have some questions about feeding.

I have read that overfeeding is bad for the snake, so I want to figure out how much food is enough.

My snake is about 18" long, and is a little narrower than the pinky mice I have to feed him. I have no idea how old he is. He was in the pet store about a month when I got him. The staffer who did the feedings said he was eating 1 pinky once a week mostly, but had eaten 2 in a feeding recently. I fed him one the week after we got him. I fed him 2 the following week because he ate the first one in no time flat. It's been about a week, so I'm going to feed him again.

When he ate 1, the bulge was visible for about one and a half days. When he ate 2, it was more like 2 and a half days.

Should I let him have 2 if he's willing to eat it, or is this over-feeding? Is he young enough to be feeding more frequently perhaps?

Thanks,
rg