Need some help gendering

I think you need to wait another week or so, but I don't have coturnix so I'm no expert.
1 has a few orange feathers that could indicate male, but he also has spots which would indicate female - I think I remember reading the spots will likely molt away quickly if it's a male. 2 and 4 looks like females, but as they are not fully feathered yet, I'm not sure it'll stay that way. 3 is a different color mutation and can't be feather sexed - you'll probably have to listen for crowing at 4-6 weeks with that one.

 

Agree with DK, those would be my guesses also.

 

The females will have more of a spotted chest, the males will have more of a rusty plain chest