No, I don’t think that is it. Everyone else is doing fantastic. It’s just them. I have one more who has externally pipped. I want to see if this little one does better. If not I may just leave it to their moms to hatch them. One of them has officially decided to go broody. I guess I shouldn’t say officially but she is still on the eggs. And boy she worked hard to get some fake eggs under her. The pink is where she took the fake eggs from and you can see her in the blue of where she is.I'm so sorry about your Cochin babies. Is it possible the heat plate isn't warm enough or too hot? Maybe place a thermometer under it and see if it's hitting the mark for temperature.