Arm waving means submission, in other words "you're bigger than me, so please don't eat me". Beard puffing can just mean your baby has discovered he/she has a beard & is stretching it out. Usually
black bearding is to show dominance, fear or anger. I have 5 adult males, they puff,
black beard & bob just for the fun of it and always at each other if one is out roaming. One of mine discovered, at 5 mo old, that he could make a
black beard & actually crossed his eyes trying to see if, so much so that he fell off his log :lol: He's now 4 1/2 yrs old & rarely black beards, only if something really bothering him.
How old is your beardie? If under 5 mo old, then he/she's just discovering what a beard is all about. If he turns out to be a male, expect
black bearding at about 5 mo old, or if a female not so much, what I call brown-bearding. If you lift his/her tail 90 degrees, and you see two bumps, one on each side of the tail above the vent, it's a boy. If a lump underneath the vent, it's a girl. Sometimes they're not old enough to determine. Check out the article on sexing at the top of the site, it explains with pictures what to look for.