If the cedar has been aged and left out in the open air for a year or more it is fine to use, I am currently using a big pile I have that has been outside for 2 yrs and it is not having any affects what so ever on the chicks.
I've heard of people mixing up their shavings 1 bag cedar to 4 bags pine and using that for their grown birds with no ill effects & it helps keep bugs away.