I move them into a tractor/brooder at about a week. Depending on what I have hatching. I move them out of the brooder at around 3-4 weeks. Again it depends on my need for the space. Some are mature enough to leave the tractor, others whine about being in the big world. I start them free ranging from the tractor if I have room and nobody needing the space. I am going to try and sell the little guy for 5 bucks just to get rid of him. A only child would be a PITA.