What gender are these mixed Runner, Ancona & Campbell ducklings?

[Sequoia Raven Bird Farms]

These 9 ducklings were hatched July 6th by Quilly the Dark Campbell hen, and turn 7 weeks old today.

Their possible mothers are:
Quilly - Dark Campbell
Ms. Rolley - Khaki Campbell
Sweet Pea - Khaki Campbell
Ms. Pretty - Tri Colored Ancona
Pearl - Lilac Ancona

Their father is a Green Billed, Grey Indian Runner.

Since some of those breeds are mallard - derived, is it possible to tell the males from the female at this age?
Here they are:

They are 6 weeks old in the video.
I hope you can see them well in the video I made for their ad.
Thank you

P.S They all stand like runners.

 

[Jenbirdee]

These 9 ducklings were hatched July 6th by Quilly the Dark Campbell hen, and turn 7 weeks old today.

Their possible mothers are:
Quilly - Dark Campbell
Ms. Rolley - Khaki Campbell
Sweet Pea - Khaki Campbell
Ms. Pretty - Tri Colored Ancona
Pearl - Lilac Ancona

Their father is a Green Billed, Grey Indian Runner.

Since some of those breeds are mallard - derived, is it possible to tell the males from the female at this age?
Here they are:

They are 6 weeks old in the video.
I hope you can see them well in the video I made for their ad.
Thank you

P.S They all stand like runners.

is there any audio with this video because I’m not getting it and the way to tell the sex at seven weeks old is voice sexing only the females will quack the males make a different kind of sound like cree cree

 

[Sequoia Raven Bird Farms]

is there any audio with this video because I’m not getting it and the way to tell the sex at seven weeks old is voice sexing only the females will quack the males make a different kind of sound like cree cree

There's audio but it's turned down. That's really cool thank you!
I think I know who's a girl then!

 

[Luv Ducks]

There's audio but it's turned down. That's really cool thank you!
I think I know who's a girl then!

Yes I could hear girls but also drakes, I just couldn't tell who was who. They are beautiful ducks!!!

 

[Sequoia Raven Bird Farms]

Yes I could hear girls but also drakes, I just couldn't tell who was who. They are beautiful ducks!!!

Thank you! Yes all their cheep cheeps and quacks blend together, but when we pick up a single duckling they make their noise and it's easy to tell!