What breed and sex could this 8 week old be?

[plmcmillan]

When I got my chicks I was told Cornish. But I'm not sure that's correct. Also, these had pullet tags, but I'm leaning a little towards rooster for this one. Any help with breed and sex guesses?

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[plmcmillan]

 

[plmcmillan]

 

[chick lovers]

I would also lean toward rooster, Maybe white rock?? It looks to small to be cornish.
What breed is the black and white chick in the bottom right-hand corner of the last picture, she's pretty.

 

[plmcmillan]

She is supposed to be an Ancona. She's a quick, flighty little thing. Her legs are speckled too. She causes more rounds of "chicken chase" than any of the others!

 

[Mountain Peeps]

White rock roo.

 

[BantamLover21]

Looks like either a White Rock, or White Leghorn. For now, I'd say cockerel.