Medicated chick starter for the first 2 weeks. Then, the starter feed plus a hard boiled or scrambled egg 2 or 3 times a week, ground up really small. At 3 or 4 weeks, I add a box of sand and start giving them finely ground greens and fruits (basically some of what the big girls get, just chopped a lot more) and ground sesame and flax seeds. At some point, I stop grinding the seeds because they are big enough to eat them whole. I can't say exactly when that is, but you can tell by their size. They always have the chick feed available free choice 24/7. At 8 weeks, they get switched to grower feed, plus treats. I'll sometimes dig up a patch of grass and soil from the yard for them to play with. Once the weather warms, they go outside for part of the day in a temporary run, so they get plenty of grit and grass and bug then.