Diamondgirl, Some hens, even those tat go broody often, just don't make good mothers.
Your chicks should be fine together, Some chicks are active as soon as they dry off but some get pretty tired from pecking themselves out of the egg but the 1 day old should be pretty active by the end of the first day and they can all go into the brooder together. Chicks that are up to two weeks apart are fine housed together.
BTW if a chick is cheeping loudly it is often a sign that it is cold. Books seem to recommend 95 degrees for the first week but I have found that 88-92 degrees is the temp my chicks usually preferred. Just keep lowering the brooder lamp an inch at a time until they are moving around the entire area without avoiding the center of the light. Lower the temp 5 degrees every week until the birds are fully feathered.
Edited by aggiemae - 9/9/13 at 2:05am