I have 4 three week old chicks and should be having one or two more hatch out in the next 2 days. Is it ok to mix these two ages or will the older birds pick on the new babies? I wouldn't put them together until the new chicks are several days old. I really would like these two hatches to grow up together so when I take the males out and put the pullets in with the six big girls they will have the number/support of their group behind them to help with integration. Thanks for your advice in advance.