I know that when they start to quack you can tell the females from the males. But i was wondering if you can tell at a week or so? I have a couple of babies that do not peep hardly at all. One in particular is so very calm, and tries to snuggle up into my hair. He never peeps and is just such a love bug, and is quickly becoming my favorite. I have a couple of other babies that all they do is scream...two in particular. I mean i pick them up and PEEP PEEP PEEP PEEP non stop until i put them down or they are with a buddy . I had no idea such a loud noise could come from such a small little body. Are females more vocal already? I have pekins and mallards. Thanks.