When Do Weight Gains Become Bad?

When does a weight gain become bad? I'm noticing that my little bud is starting to gain weight. I've only had him for a few weeks now, and he seemed a little under nourished when I got him, so I don't think these gains are at all bad, but I'm just wondering.

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You'll know when its getting too fat when the scales are starting to stretch out and you can see the skin under. But usually growth is always good for younger snakes

Lol you're the first person I've seen worried about the snake getting big. List feed it once a week and you should be fine

When they have a double chin.