I have a new little duck whose nostrils are closing up and it's having a ard time breathing. I'm constantly give them new bedding several times a day because they wet their bedding down with water. I also let them swim in the bathtub so they are able to dip their heads under water to get clean. I'm just wondering if this is an infection that's causing mucus buildup? Will an antibiotic help or do little ducklings usually end up dying if they have a respiratory infection?