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the last one i raised myself (not by mommy) i put our quite early every day for a little bit - as long as it was warm and no wind. You just have to keep an eye on them. When they start to huddle, they are cold. but sunshine is good for them.

And to leave them out permanently, you have to give them warmth and protection from predators. a heating pad under and a blanket cover over might be enough. what are your night temps right now?