He looks just a little backed up to me. This happens sometimes with hatchlings. Their urinates can clog up and a lump will form. You can see the darker feces in him. If you gently rub his belly sometimes you can work it down and out. Just watch out. Sometimes it gets pretty messy lol. I would take to a vet if it doesn't go away in a few days maybe even a week, but I don't see the need to freak out yet.
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