This is my first experience with a broody hen. We let her sit on eggs and she had what seemed to be a healthy chick. Me and my husband debated bringing the chick inside, but decided to leave it out with mom. About 3 days after the chick hatched I went outside the chick was outside the coop chirping all alone and mom was inside sitting on her eggs. I decided mom wasn't going to take good care of the chick so I brought him inside. I have raised at least 1 - 2 week old chicks before along with quails and quinneas. So this is not my first time with baby birds. I put him in a box with a heat lamp, chick crumbles and water. He seemed fine, then the next morning I woke up and he was dead. I have no idea what happened, can someone please shed some light on this??? My hen may hatch other chicks, since we are past the 21 day mark and I do not want them to die to. Any help would be greatly appreciated.