Trying to guess the sex of 3 day old chicks

We are trying to guess the sex of these three day old chicks?
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[@enjoyslifeoutdoors5635]

I'm curious to find out

[@j.f.outdoors8460]

Thanks. Me too. It will be interesting to see if the theory is correct.

[@todphillips3935]

the three black ones, those are black star. The one with the white on the head is a cockerel, and the other two are pullets.

[@todphillips3935]

both vent sexing and wing sexing need to be done on the first day.

[@telsclark]

Did they all turn out to be girls?