At what age are button quail feather sexable?

[PattieTheDuck]

I have 4 button quails who are all 3 weeks old and Jm quite curious of their gender at the moment.

 

[Nabiki]

Button quail take longer to mature than coturnix. I would wait at least a couple more weeks.

 

[PattieTheDuck]

Button quail take longer to mature than coturnix. I would wait at least a couple more weeks.

Alright. I’m mostly curious because I swear I see reddish feathers around the vent area of atleast one of them