How to sex call ducklings by plumage colour? “Needing advice”

[Brianna245]

I am very new to call ducks, and I have recently had a hatch of 8 ducklings. The parents were sold to me as snowy call ducks. The babies are a month now and losing their duckling fluff, and some interesting colours are popping up. Are they snowy as well? And can it help tell their gender by the colouring of their head? I know the males get darker colouring. Opinions on colouring and gender are very much wanted! Thanks

Duckling A

Duckling B

Duckling C

Duckling D

Parents

 

[CherishedFowlGuardian]

Try tagging @Jenbirdee This person might have this breed, but I don't.

 

[Jenbirdee]

They are so beautiful
But I don’t have any calls for regular size ducks and you usually have to wait till they’re five or six weeks old and listen for quack (female) or a Cree Cree type sound ( male)

 

[Jenbirdee]

Maybe @KathiQuacks

 

[KathiQuacks]

I’m not sure if the Dad is considered Snowy or not, looks like he has a blue gene. Mom seems a bit light too, I’m not sure. I’m not the best with color ID.

Males tend to get dark heads and solid, pale bills, yes.. Just guessing, I’d say A & C male, B & D female, but it is early.
I would go by voice right now, personally. Females will get a honk to start, developing into a loud quack. Males a raspy peep, developing into a low rasp.