I have 5 Pekin ducklings that are 6 weeks old this week. One I have noticed has been sleeping with its head on the ground, kind of long outstretched in front of its body. First I thought maybe it was a quirky way to sleep, but it seems as though when the rest of the ducks are kicking around it sits back by itself sometimes. Other than that it eats and drinks just fine. Could this be early signs of a vitamin deficiency? And if so do you Know which in particular? I have been putting the duvet vitamins and electrolytes in their water at night but I’m wondering if it’s something more specific. I had a duckling get niacin deficiency very severe in the past and I am scared and want to catch this early if it is something! Thank you!