I just wanted to add in that the "stress marks" as they are so often called are natural markings on baby dragons and are often prominent, especially under their basking lights and UVB. They will darken to better absorb the waves and heat, making these stripes a lot more apparent.
These marks are
not always indicative of stress, though with being a new baby as well, he is likely a little stressed by default.
I showed this comparison to someone recently:
Dark in the enclosure, you can see the "stress marks"
Light outside of the enclosure, no longer darkened to absorb lights as he is not under them
These marks fade with age, but are very consistent the younger they are. Do not let the common name for them misguide you, it is natural