Can you please help me tell their sex?

[Kim bi3]

My rouen ducks will be 6 weeks old on Wednesday and I'm just curious what sex you think they are?
This is my first time ever having poultry.
Thanks!

 

[floppysquirrel04]

When they’re 8-10 weeks pick them up, and the females will have a hard quack sound and the males will sound more raspy. The older they are the more accurate it is if you’ve never done it. You can look up some videos of people doing it too to hear the sounds. The males will also develop curly feathers on their tails when they get older. You won’t be able to tell by their plumage for quite a while.

 

[Isaac 0]

BTW, they aren't all Rouen's.

 

[Jaeden0720]

I strongly recemond that comment from FloppySquirrrel04