It's very frustrating, I know. It sounds like you are doing everything you can for this little one.
Do the other chicks trample it or Peck it at all?
When I had a weak chick, I had to separate her from the others, with her own heat lamp stuffed animal and food and water before she would eat or drink on her own. Keep up with the vitamins and hand feeding. She might just be a little slow starting out. My weak chick (Bernice) stayed about 1/2 the size of the others until she was 3 months old. Then she caught up with a growth spurt in about a week after moving outside.
I will admit, I carried her around stuffed in my shirt for security while doing stuff around the house!
Wishing you luck-
Do the other chicks trample it or Peck it at all?
When I had a weak chick, I had to separate her from the others, with her own heat lamp stuffed animal and food and water before she would eat or drink on her own. Keep up with the vitamins and hand feeding. She might just be a little slow starting out. My weak chick (Bernice) stayed about 1/2 the size of the others until she was 3 months old. Then she caught up with a growth spurt in about a week after moving outside.
I will admit, I carried her around stuffed in my shirt for security while doing stuff around the house!
Wishing you luck-