Our chickies are 4wks 3 days old. THey have been on chick starter since day one. How long do we feed starter and when do we start changing their diet. I have to admit they have had some greens from the garden and little bit of yogurt. They did great, but I don't want to give them things they really cant tolerate. We asked at the feed store and got conflicting info. What are your thoughts, what have you done?