Pullets chest bump too. I'm in agreement with Gray Farms. The bird in front in the last picture is the likeliest cockerel. But I think it's very possible you have 2 if not 3 pullets. Wait until they are at least 7 weeks old and post again. Hopefully things will be clearer then.ok will post some more when they are 6 weeks. but my gut feeling is cockerels. two are as they are always chest bumping.