Hello everyone, I have a runt Muscovy duckling. He/she should be around five weeks old. I will stick to calling it a him for sanity's sake. The problem is he flips over when trying to move in any direction. He mostly sits on his elbows with his feet stretched out in front and scoots backwards. He will then try to run forward and fall to the side. He is way underdeveloped, the size and look of a 2 week old. I've resorted to keeping him inside in a giant plastic tub. He sleeps on a heating pad (on low) between his sock (filled with rice) siblings. He sleeps almost all day. I keep electrolyte water (started the vitamin addition last week) with cracked corn and floating catfish food available at all times. He takes regular baths about every two hours (of course I put him in the water and dry him off). He doesn't swim around very much, mostly just sits there. He has regular number 2s. I am asking for any help, please. I have researched every possible idea. I am attaching a few pictures for reference to size. In the last photo, he is the farthest on the right.