Just my experience, but as a kid, we had a murderous bantam hen. She loved her chicks, but she also thought that their blood was tasty. So when she hatched chicks (as soon as they were out of the shell), we just put them under the heat lamp. Once or twice, we put partially-hatched eggs under the heat lamp too. The only time we ever had one die was when it hatched with the yolk still attached and the others pecked at it. Damp chicks did just fine in the brooder. (and no, they didn't shrink-wrap. Which, looking back, is sort-of odd, but considering how many kids were crowded around watching them hatch, there was probably a little assisted hatching involved.)