She's only 6 days old and has been down for 2 days. She has always been a bit smaller than the others. 2 days ago she laid under the heat plate all day. I removed her a few times and noticed she was weak and walking wobbly. Her mobility has decreased dramatically. She is now HALF the size of all the others. I have her separated in her own brooder and have been giving her water by hand and moving her to her food. She still eats on her own. Her stool looks normal. No pasty butt ever. All other chicks (14) are healthy. When she does walk, she is low to the ground. I don't believe she has spraddle leg both feet are under body, toes out and feet pointed straight. She sorta falls side to side and uses her wings to walk. When she eats she stands a little taller off her hocks. Hocks look and feel ok but I have no experience with chickens until now. She peeps continuously. She is alone in her brooder I have tried several different chicks to buddy with her but they all peck or run her over. They all had a drop of Poultry Nutri Drench when they arrived and have had 2cc per gallon of water in their drinkers since. I gave her another drop of PND yesterday. She will not eat anything other than her finely ground starter feed.