I have a friend who for personal reasons couldn't finish an incubation, because they were already at day 15 she didn't want to just turn off the incubator so she asked if I wanted them. i had just hatch out Pekins and Frizzles, so I cleaned my incubator and put hers in. They all began hatching a couple of days ago and all but one have finished hatching (the last one is doing fine, has only just pipped) one of the chicks won't stand, it keeps flopping on its side. The chick appeared to hatch normally and had a tiny bubble of yolk sac left so I left it in the incubator. Then all of a sudden it looked like the yolk sac was completely coming back out. I didn't know what to do and everything on the net was saying leave it, it will drop off, so I did and it did, It kinda popped and then fell off. I sprayed some betadine on it and once it had dried and all the other chicks couldn't wait in the incubator any longer (cause of the late to the show hatcher) I quickly took them all out and closed it back up. All of the chicks except two were standing and doing well, one wasn't I gave it some electrolytes and it is up and running around and then there is this one which is throwing itself on its side. I have given small amounts of chick-saver but doesn't seem to be getting better. It just lies directly under the heat lamp. I have had to separate it from the others by placing a small box inside of the brooder, it can still move away from the light but it screams as soon as the light is of it. Im wondering if maybe this is an umbilical infection. There is no discharge or anything but the chick isn't well. She also kicks her legs a lot and when placed upright she kicks out and immediately falls back tot he same side never the other side. What should I do?