welcome!!! i'm on Tapatalk and can't see the pics unfortunately, but i'm sure donnadudette2003 is right with her assessment!
i have a new hatchling too and she looks thin, but they're young and will fill out before you know it. here's a feeding guide that a lot of us use to properly feed our noodles.
Is it recommended to choose a rat over a mouse if both are listed and is there a transition from one to another? I've been told that you can remain on mice for the life of the snake as long as your not intending to breed (speaking on the male that I have).