I recieved 28 day old chicks in the mail on Thursday morning. 22 were dead! Of the six that have survived, 5 are doing great. One is still a bit wobbly, but I think will make it. My question is...my local feed store has an over abundance of baby chicks, Some have just arrived and some are several weeks old. I'd like to add to my flock, can I mix them in with my little band? Should I just get the youngest or.... I don't have the coop ready yet to move anyone out, figured I had a couple of weeks to get it done.