Hi, I got 12 light sussex fertile eggs from a breeder. 2 ended up not fertile, one had blood ring at about 2 days. 6 are still growing(it is 14 days today), but today I opened up the other three because they were not growing. From online diagrams my guess is that they died at day 8. They were also all exactly the same size so they must have died at the same time. But looking back to that day, I can't remember anything that happened dramatically. My mom did have to shift the incubator, but she kept the temp constant. Could that have been the cause? Or do sometimes they just stop developing??