The indicator for hypo are 20 clear nails with no black in them. For trans it's the black eyes. Cute little dragon!
The marks are called stress marks, since they often show up when the dragon is displaying it's "unhappy" colors. They are common on babies. They can be for many reasons, and learning your dragons colors will help decider it's moods and what, if anything is wrong. Dark usually means they don't like something, or they are trying to soak up more heat/UVB light. Sometimes it means your husbandry needs to be checked, or that they are not feeling well. Sometimes it means they need to take a poop, or someone like that. Rule out stress (living with other dragons can be stressful) and husbandry, and you are likely fine.
Looks like he MIGHT be a hypo/trans...but I can't see a clear cut picture of his nails.
You really need to house your dragons separately. That can be a cause for those markings (stress marks) on their bellies. They are solitary creatures, and do NOT need to live with other dragons. Multiple dragons means multiple tanks. No matter what age they are.
Thats called stress marks, baby dragons seam to do that even if they are feeling good. Mine did that for several months, but then lightened up. He also lightened up when I held him Oh and by the way that is a very cute photo, I want to rub his belly
My beardie got that same belly pattern after the first shed and it was very pronounced. Now it is not so much, it did not cause any alarm for me when I noticed it but I only have one verses you having multiples.
I don't feel like it is bad but I will keep an eye on it. Thanks for sharing.