I'm no expert on beardie morphs, but to sex it what you're going to want to do is place it on a flat surface and gently lift up the tail to around 90 degrees (the back feet may slightly lift off the surface) and check the tail right behind the cloaca. You're looking to see if it has one "bump" in the center of that area with dimples off to the side (female) or a pair of bumps dimpled in the center (male). That being said, it can be really hard to tell on them when they're young and small, so you may need to wait until he/she is around 7-9 inches long or so.
Picture to help explain;
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