They look good to me!
Around 10 weeks.
The hens tail feathers are usually rounded at the end, the rosters are sharp and pointy.
You can usually see the difference in barring by about 4 to 6 weeks with purebred Barred Rocks.
Males have two copies of the barring gene. Females can only have one copy. This means that males have twice as much white as females. Males have wider bars of white, and more narrow black bars.
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