I will be brief Im new to raising chickens. Let me say it was my wifes idea to get them then after a month it became my responsibility. Go figure... anyways we love them and after reading so much about them, I feel like a chicken with his head cut off. (No pun attended) there is just so MUCH. Anyways I love this site and the people are funny and good. I will be back a lot. We started with 6 chicks and now theyre 4-5months old and now we have 9 totaling all together. After all I have read about introducing new chicks to the flock I found it to be interesting but different to every situation. Just recently I added 2 2month olds to the 4-5months and they are doing fine. And then I add the new 3 which I would guess are 3months and there no problem its like they didnt skip a beat. I just wish everyone has this good of luck with introducing young chicks with an existing flock.