Blue Sumatran/Buff Orpington cross age 4 months I know but sex???
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Agreed.Top bird appears to be a cockerel
The BO appear to be pullets - yes the bird you are suspicious off has a more developed comb/wattles, but I am not seeing any of the hallmark "roo" characteristics for BOs.
X2The Sumatra mix looks like a cockerel, as well as the Orp behind him.
Next pic looks like pullets.
Broody momma's babies all look like pullets, but no guarantees without better pics