I have a Brahma chick that is not doing well. She is now 3 weeks old. She started showing symptoms at 7days old. Her poop is normal and she eats and drinks great, She is growing a little less than the other chicks here are the problems. Her head is in constant tremors, she sits on her haunches and when she tries to walk she comes up on her legs a little however falls from side to side. She tries to use her wings to stabilize her balance. She doesn't make it very far. Any help is greatly appreciated.