I don't know this by experience, but I do know that Ideal states this in there FAQ:
"Cover the floor with an inch or two of rice hulls, shavings, ground corncobs or other semi-coarse, absorbent products that do not easily mat. DO NOT USE CEDAR SHAVINGS, cedar is toxic to chickens. The litter should be covered with burlap material, cheesecloth, paper towels or other non-slick material for the first three days. This will prevent the babies from eating the litter, reduce the possibility of the babies from becoming sprattle-legged and provide for easy access of feed sprinkled on top of the material."
I think that maybe you should go with the whole "better safe than sorry" plan, and get some pine or alternate bedding. You could always sell the bag of cedar you bought on craigslist or something, that way you havent totally wasted your money.