well thats good. mine arnt yet that far and i was wondering how can you tell if they poped the air cell? or will i just know looking at it kinda like the candling thing? im on my first incubator hatch:P
i know this wont help but MINE ARE DUE THE SAME DAY!!! did your temp spike for a few days? they grow faster when the temp is up. not that that is a good thing...