Bantam Cochin Calicos sexing

[josiecoop]

I was wondering if someone could help me out with this. I have 5, 2 week old bantam calico cochins that were hatched by mommy hen. Three of which have long wing feathers and the other two have little "nubby" wing feathers so far. Is this a way that I can sex them? Hope you can see the difference in the picture. They wouldn't stay still for a second!

I thought it strange that their wing feathers would mature in so differently considering they are all from the same hatch.