Help vent sexing 2 weeks old quail?

[Linita]

Hi,

They're japanese coturnix quail.

If not vent sexing, then vent-guessing.

So I have 7 quail now and I'm only gonna be able to keep 2 or 3. And may will have to sell them at some point, so they better be females.
I know it's pretty difficult to vent sex them. Specially when they're just a few days old, but I wonder if at 2 weeks now it'd be somewhat easier? Does anyone have experience with this and can help me take a guess?

It was very difficult to take the pictures and I know they're not the best, but I put a lot of effort into them so I hope you can give me your guess.

Also, if that's not the right way to look at the cloaca please tell me.

I found a paper as to how to sex day-old japanese quail and I attach the picture also here

I have only included photos of 5 birds naming A-E.

 

[Nabiki]

Vent sexing is best done when they reach sexual maturity. You're not going to be able to tell on chicks with any accuracy.