think I have 4 cockerels... sigh.They're too young to sex with much accuracy, but there are a few tricks that may be helpful:Feather growth & body posture & personality.
In many breeds, the females grow in their wing & tail feathers faster. When they're 1-2 weeks old, the females will have wings that reach to (or past) the end of their bodies. They also grow little tails by the end of their 1st week while the males still have only chick fluff & stumpy short wings. Males will stand slightly taller & alert. Males may also be less skittish. Boys will still have chick fluff in areas while their sisters of the same age have feathers. Sometimes the males seem more friendly / playful which is why my kids always fall in love with roosters. LOL
Here are some examples of what I mean. (Chicks = 3 weeks old)
Below: female chick has long tail & looks very well feathered
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Left - male; notice the stance, lack of feathers on the wing shoulders, & stumpy tail
right - female; more rounded body posture, longer tail
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Pic below, the female is in front.
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They are the prettiest ones too.. .Time will tell.. .I'll post again at 8 weeks of age. Thought one maybe a Welsummer cockerel but legs aren't yellow.