I have a week old duckling that I am unsure will survive. When hatched there was a significant amount of blood and yolk in the shell (the most I've ever seen on any bird). It spent 2 days in the incubator before I felt it was going to live. At that time it still could not walk well, it appeared to not be able to control it's left leg and the left eye didn't look right, almost like it is not developed correctly - smaller than the other side. It can now walk fine, the eye still looks off. It cries a lot. I have watched it eat, which seems to be a struggle for it and it does not drink water as often as the other duckling while it eats. I have hand fed it several times and offered boiled egg yesterday and today. The hatch-mate duckling is 2 days older and over 4 times bigger. This little one just isn't thriving and growing. I hate to think it is suffering, but am not ready to give up if anyone has some advice. Oh, you might want to know what I'm feeding - it is un-medicated chick starter and yesterday I started giving them finely chopped green grass.