Putting baby chicks in the coop.
Definitely separate them! They are still too small to stand up to the big chickens. Keep them separated for about another month, until they are a good size. Then if you have a big yard let them out with the others and watch them. The bigger the yard the better it will be for them.
And if you can section off a little area for the chicks outside. It will help them get used to it before you put them with the others.