I would not feed him every 5 days. They are not ball pythons, and their metabolism is not like them. Typically it is recommended to feed them every 7-10 days when young, and slow grow them. Yours looks good. Mine is about that old, has only shed once with me, and is at 173 grams. They are not supposed to be round. Also, from what I have been told, and read here, prey should not really leave a noticeable bump. So, no, I don't think yours is too skinny. I think he looks good.

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