Feather sexing? How to?

[CrazyChicken Lady]

So I don’t think this thread is in the right place but I didn’t think it belonged In the breed or gender so I put it here. How to feather sex chicks? Especially with mixed breeds? These chicks are 4-5 days old and I can already see wing feathers developing. Is it too early? To tell? I’ll go ahead and post pictures just in case someone can help.

Chick #1
BO x OE ( I think...? )

Chick #2
Same breed as #1

EE xOE

Probably can’t tell but I’m still curious about people’s opinions.
Thanks!

 

[Hannahnic14]

I pretty sure only certain breeds can be feather sexed Not sure what those breeds are though.