Sexing Khaki Campbells

[backyardio]

I'm trying to sex these ducks. Any help would be appreciated. Don't remember if it was all females or straight run at the store. They were born March 9, So they are about 1.5 months old. Thank you.

 

[Isaac 0]

Females quack, males make peeps/whistle at that age. If you search 'Sexing Ducklings" you will find hundreds of threads regarding this topic.