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I haven't had buttons give out foam. They are not coturnix so the foam is not an indicator. I looked in my breeder pens, some of my blue face tux males have red vents, others do not. If your cbbq is slimmer and crowing, it's a boy. The vent is smaller than a laying hen which looks more open.

The Splashes and some tuxedos have the red vents. If your tuxedo doesn't have any coloring around the vent I would say hen.