My chick has an unabsorbed yolk sack. it was born just under 24hours ago and the yolk sack is about half the size it was when it was born. The chick is in a box with a heat light and no food or water? What do i do with it? Does it need food or water? Is there a supplement/ vitamin/ mineral etc. that will help it? Will oxymav b a broad spectrum antibiotic help?