hello, I hatched 18 ducklings 7-9 days ago. Just tonight I’ve noticed many of them have spots with little baby fuzz on their necks. There are three buffs, a welsh harlequin, and a khaki campbell with these spots. I don’t think it’s just water making them appear bald. While this scares me a little, what makes me more worried is that 5 of the 6 (the khaki campbell excluded) seem to have a lot of mucus in their mouth, throat, etc. I read that apple cider vinegar helps so I dipped their bills into a small cup of that and they seemed to drink it and react to the bitterness. I also put some poultry vitamins in their water to help weak ducklings. Please help as I don’t want to lose any of them!!