What gender are my ducks?

[Sophiamarie]

Hello! Could anyone please help me sex these three ducklings around 7 weeks old? Thanks.

 

[Crazy Maizie]

Cute. I will tag a few that might be able to help.
@Quatie
@AstroDuck
@fatty and friends
@Isadora

 

[fatty and friends]

crested pekin, silver appleyard (drake?) and rouen drake

 

[Quatie]

They are a bit young to know for sure. Sound is the best way. If they quack loudly they are a female, and araspy voice they are a male. Some take longer to change their voices and may not happen till 10 weeks old at the latest. I usually hear it sooner than that. They should have their first molt a few weeks after their feathers fully come in. They will get their adult feathers and including male's colored head and tail curl. The crested pekin will not get a colored head, so sound and tail curl are the only way to tell.

Beak color can also be an indication for gender, but from my understanding it is not always accurate. Males from some breeds tend to have yellowish or greenish beaks.