So, I've been raising chickens for a while but, I've always received my birds at 16-20weeks old. A friend of mine whos dad owns a feed store offered me 2 Barred Rock and 2 RIR chicks that he states to be 6-7weeks old (of which that looks to be accurate). it appears that they've just finished feathering out. They were apparently ordered by someone who didn't pick them up. He claims that they're all females that were sexed at the hatchery prior to his purchasing them....?? I've raised (my previous game hens raised... years ago) many, many chicks without any help from me what-so-ever. These 4 are still rather small chicks and, I know I can't put them in with the flock until later. My question is, should I keep them under a heat lamp for now? What's the appropriate age to have them in a coop of their own (that's not a broader). Its beginning to get a nip in the air at night, and probably not the best time of year to have young chicks... But I'm not about to turn down free female BR's and the RIR's are just icing on the cake (i really like the heritage breeds). Any advice would be very much appreciated.