All i know is that white chick looks like a cockerel to me....
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Some of the pullets will have considerable white on them. But the red on the head? That's a pullet. The cockerels are truly white, with red/brown that comes in on their saddles, backs and wings as they mature. Hope that helps. Plus, at 5 1/2 weeks, see the comb and wattles on that feller? Pullets won't sprout those until they approach sexual maturity at 14 weeks. Even if the coloration wasn't distinctive? The combs and wattles sexing at 6 weeks is a very sure thing.