Pied bearded dragons hatch normal, and lose color in patches as they mature. There is also an "anery patch" as well as a "purple patch" phenotype of the hypo + translucent gene polygenic combination. Pied is possible, but likely a purple patch and furthermore, if there are three of them, it's likely something completely different. I have not watched any of the above transition, I cannot say what to expect,
To the op: Are there any non-translucent dragons losing color too, or is this expressed only in the translucent offspring?