Early this morning he passed away. I tried so hard to medicate him and get him the help he needed, but he just didn't improve. He was only 10 days old from hatch, but the pain I feel losing him is no different than losing some of my long time pets.
If I could go back in time I would have got him help sooner. I noticed he was a little bit slower than the other 2 ducks on Saturday. On Sunday, you could see his body visibly moving while breathing. Took him straight to an emergency vet and started antibiotics. Maybe it was blind optimism, but on Monday I thought he seemed a little better. I would occasionally catch him pecking at the food. On Tuesday, we could see a noticeable change for the worse. He didn't have enough energy to walk around more than a step or 2. His breathing was labored. This morning, it seemed like death was inevitable and when checking on him a couple hours later he was gone.
I just want to thank everyone here for trying to help me, and giving encouraging and helpful information. I don't know what went wrong with him. Maybe a respiratory infection, maybe he inhaled water which led to pneumonia, enlarged heart, disease. Whatever it was felt untreatable. I changed their bedding multiple times a day, gave them clean water, and food. Provided plenty of heat and kept the box in a healthy range. I don't know what I could have did differently, or that anything I could have done would have prevented this. That little guy has forever altered me.