I would feed chicks nothing except their starter till they are over a month old at least, maybe some chopped hardboiled eggs, but no corn. They need high protein and corn is like candy, especially as babies. Too many carbs, not enough protein. In fact, I only feed my chicks starter/grower for at least two months before giving them anything else other than small hardboiled egg pieces. They'll need grit if you do and they wont have enough of the proper nutrition to grow-they grow at surprising rates, too!
The chicks I am feeding the corn to are a month old and have featherd out already there the meat chickens Cornish S/R I will not feed them Corn any more thanks for the advice they still live in my house at they still live in my house at this point I am building the coop so they are being housed in a huge dog traing cage with chicken wire wrapped around it