Help I don't know what ones a male or female

[My babies are ducks]

 

[chickens really]

Olive Bill is the Drake...

 

[sylviethecochin]

Sexing ducks: http://www.majesticwaterfowl.org/artquacks.htm

Also, that would appear to be a female, but how old is she? She might be a He in juvenile plumage whose bill hasn't darkened yet.