They are big enough to move to the transitional coop where they can see the big chickens and the big chickens can see them. This gives both populations a chance to get used to being together while allowing the teenagers to get a little bigger, enabling them to hold their own when they are assimilated into the larger population in the main coop.
We usually start this transitioning when the chicks get to be about 5-6 weeks old, but how big they’ve gotten, how strong they seem, how (awful) the weather is…all these things are considered when we are timing the move.
They are currently eating up a storm. Bright and active, they are still somewhat skittish as they adjust to their new digs. My son commented that he thought that his batch of chicks was friendlier overall than prior ones; they tolerated our picking them up without much fuss. This comes in handy when friends come to visit and want to hold a chick.
We have about 19 teenagers at the moment (well, 20 counting my son, who will not be one for much longer either, come to think of it), and as they get older we are learning that the breeds may turn out not to be what we ordered. Determining the sex of a chick is not an exact science, and some vendors are better at it than others. The White Leghorns (might be White Rocks) and the Light Orpingtons (might be Buff Orpingtons) are in question at the moment, but as is true with most things, time will tell.
They should be off the heat lamp by next week. For now, they are adjusting well to their Brave New World.