Three of my chicks are developing slower than the others (I know different breeds do develop faster or slower). They look to be about one week behind everyone else. When I go to place them outside permanently, would it be ok to keep the three smaller guys inside for one more week? Or would it cause problems when I release them with everyone else a week later? Would I have to "introduce" them all over again? I did not hatch these guys myself, they came from a hatchery.