I have 3 week old chicks. I have been putting them outside for about 30 minutes since the weather is warmer. When I first got them, they were on medicated feed and then I ran out. I switched to unmedicated since that was what was available at my farm store. I was reading through some posts that the occidiosis (spelling not right I am sure) has something to do with them being outside in the soil as well as in their poop. Should I not allow them outside until after 7 weeks or so. They just love it out there and I love seeing them but I want to take the best of care. Thoughts?