I'm hoping this is the right place to post and ask this. Ok so if a chick shows signs of sickness at day 2-3 after hatching (in this case a crusty closed eye, seems off balance). Most of the other hatchlings are fine. 3 are not and one died. Do you feel that it came from something in the environment after hatching or was it likely something that came with the hatching egg? I don't have these chicks but am trying to help a friend through this situation.