This is my first hatch and experience with poultry. I hatched 8 ducklings over 4 days last week. They are now now 7, 6, 5, and 4 days old. All of my babies seem to have these cuts/sores on their feet and I have no idea what could be causing them. By brooder is lined with the soft shelf liner, which i read from several bycers that this was fine. They dont seem to be hurting them, but I have no idea what is causing them, or how to fix it. Any help would be great. Here is the brooder: you can see the shelf liner better in this pic... and this is what their feet like...this baby's is the worst, but they all have varying severity of it...it looks like cuts/sores and I cant figure it out. Help please?