This is our first hatch & we only hatched 2 eggs. Pipped yesterday, one came out this morning & the other this afternoon. They visually had zero problems & seemed perfectly healthy in the bator. When I got home from work I put them in the brooder as they've been in the bator all day. My husband just went & checked on them after maybe 20-30 minutes & they were both just lying there. One dead already & the other struggling hard. What did we do wrong?!?! I shouldn't be so attached but I'm upset they died due to our error!
My first guess would be that it was too hot in the brooder for them and they were unable to get out from under the heat. A brooder should always be set up so that the chicks can move away from the heat source. The other thought was that the chicks just didn't develop in the way that they should in order to sustain life outside the shell. For a brooder I use a cardboard box with shavings inside with paper towels over the shavings and a 75 or 100 watt bulb for heat. The chicks are able to get out from under the heat if they like. This has worked great for me for many years. Good luck on your next hatch 
