Give them plain yogurt, boiled egg finely chop give them electrolytes with vitamins so they can get energy to eat, try sugar water small quantity goohle how to make one they get energy to eat with that. Also try corid medicine to what your are describing its coccidiosis I save few chicks with electrolytes and vitamins you can get at a local feed store or tractor supply there is also this other product call save a chick electrolytes.