I have this trio of what I understand to be Welsh Harlequins. They're 5 weeks old. Any guesses as to their sex? They're starting to quack maybe a bit but still mostly just peep.
Welshies can be pretty accurately sexed the first few days after hatching...females have lighter bills and males darker. By this age that doesn't work, though. The females should be starting to quack around this age, though. The males will continue to peep longer and then it turns into a raspy quack. I have nine 8 week old welsh harlequins and they are very easy to tell apart by their voices at this age.