I hatched 5 duckling two weeks ago and four are strong and healthy. But,one is still the same size he was when he hatched! he hasnt grown at all! He is getting his fair share of food and water, and he gets brewers yeast in his food every feeding. And is still a little runt?! He also will only breath through his mouth! His nose is stuffed up! Im so worried about him I will get a pic of the size difference soon!.... Also! He has been having poopy problems, and his poop sticks to his down ive been going out daily to clean it off to.