I had a deformed hatchling in the 100% Het Pied x 66% P. Het Pied clutch. It looked very similar to that YB. It sat in the egg longer than the others so I had to cut and that's what I discovered. I euthanized it immediately. It hardly had a mouth. I just had 3 other clutches hatch this week and everyone was healthy and one other clutch had hatched before the Het Pied so I don't know what happened.