I have 5 ducklings who are now 5 weeks old. Still all 5 make quiet peeping/raspy sounds. Not a single one is quacking or changing voices at all. 3 runners 1 buff 1black Swedish... in case breeds make a difference. They are all soo quiet. I even caught them each individually and held them to see if anyone would quack to get back to the others. everyone was just quiet when I held them . If one cant find its way around the gate to get out with the others it just quietly peeps/raspy sounding noises until I go help it. No one ever lets out any loud noises. I was only going to be keeping girls. And I am getting afraid I have all boys. IS 5 weeks to early to know?