I’ve been incubating duck eggs and so far two eggs started to hatch out but died right in the middle of hatching. They had both gotten holes in their egg before they died so they didn’t suffocate and I managed to have one successfully hatch and he was perfectly healthy for two days but when I checked on him this morning he was dead, his pupils were white. I just don’t know what I’m doing wrong and I don’t want any more babies to needlessly die.