Tina, I wouldn't spend the 20.00. That head looks very pullet, but she was only 7-8 weeks old in the last pics and the streamers might just take a bit longer. Her/his father and mother both have very round heads. Considering that the mother does not have wattles, the wattles on the chick suggest male. As does the video of it crowing LOL. Also, the chick has alot of dark blue on it which suprised me since it's sibling and mother are more of a light blue with lacing around the neck. So with that said, I'm thinking that maybe the dark blue is an indicater of the dark blue hackle and saddle feathers to be developed in the next month or 2.The same wc blue is crowing everyday, usually after I start talking to the chickens in the coop. I've heard of hens crowing but have no experience with it. This may sound a bit crazy, but I might just spend $20 and try the avian DNA sex testing.
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I'd suggest waiting until he/she is 12 - 16 weeks. By then the saddle/hackle feathers will be forming if it is a male.