That’s a cockerel. How old was he when you bought him? Because at 8 weeks he looks like a male also.This is my smooth silkie (I believe she's a silkie-Cochin cross)
We got her from an experienced breeder who was fairly certain she is female (judging mostly by behavior)
She's about 10 weeks old now.
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Note, the feather poofs on the top of her head here aren't streamers - it's bits of down clinging to the tips of her new pin feathers, which just started growing in. I've been keeping an eye for streamers, but I think it's too early to tell, as the adult feathers are still sheathed.
Here's her at 8 weeks:
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She has 3 prongs on the top of her comb, and her skin is white. Not sure if that's relevant!