I have a 4 week old chick who is about half the size of her sibs. She eats and drinks and runs around just like the rest of them. I'm using medicated feed. I have checked around the forum for advice and will now put some ACV in their water per several threads. I have used Poly-Vi -Sol for chick feet and neck problems with good results. Do you think giving this little hen a shot of Poly might give her a boost, as well? Thanks.