We have 3 2-week-old chicks and 3 5-month-old hens. When is the best time to introduce them? The babies are still inside with a heat lamp, but will it be okay to put them together in the same coop when the time comes for them to go outside? Our coop is large (4' W x 10' L x 6' H) so there's plenty of room. We've never put hens of different ages together so not sure the best way to proceed.