I have two sets of chicks that are three weeks apart. So far they have only been introduced in neutral areas where the babies can get away if they need to. The two sets of chicks are 3 weeks apart. Two chicks are 6weeks and 2 are 3 weeks. the six week olds are in the coop full time, and the three week olds are still in a brooder on my back porch. At what point can I add the younger ones to the coop? It's hot here even at night right now so I'm not worried about the temperature. mainly just making sure they stay aliveand well! Thanks.