So tonight is day 22 in the incubator and two have hatched. One has been struggling all day and just could not get out. He seemed to be weakening, but was far enough zipped that I knew I could hatch him without him bleeding to death. So I helped him, he's out and laying on the incubator floor, but now I'm wondering....Is there a reason he wasn't supposed to hatch?? His tummy feels kinda squashy, but not like, mushy, but now I'm worried--Does he have mushy chick disease? How common is it, and if he has it, can he spread it to the two healthy chicks who already hatched??