My chicks are 4 days old today. When I got up I noticed that one of them was making a sort-of distress call. Instead of th normal peep, she's making a chirp-chirp-chirp sound. It's not any louder than the others. They have food, water, and appear warm but not too warm. Everyone is doing their thing. When I did my pasty but check for the morning I discovered this: I know it's where the umbilical cord was attached but the other chicks only have tiny little scabs that you can't even see unless you look through their fluff. It looks like it might be necrotic around the edges. She was eating earlier. I don't want her to suffer. What do u guys think I should do?