Nice looking snake, but not a YB.
One of the things I've noticed about all of our YBs, is that none of them have bright white edging on the side panels (alien faces) like yours does. It's usually more of a yellow or gold color when they're young, fading to a cream or tan color as they mature. There may be exceptions, but none I've seen myself.
I'll post a few pics of some of ours to show you what I'm referring to. I'll also post a few belly shots to illustrate the difference there. I hope this will help you.
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