14 weeks old give or take, males or females

[MrsMacDonald]

I have no idea the breeds besides the white Pekin duck.

Can anyone tell if they are male or female yet?

 

[DemeterAD9]

The slimmer white one appear male based on the upward curled tail feather. The other I would guess female but I’m no expert. Listen to their quacks, males are higher pitched, raspy and not as loud. Females are the more usual loud duck quack one would expect.