The laws governing child performers differ greatly from state to state. It is a parent's responsibility to understand the applicable laws in their home state and also any state where their child may work. There is a very comprehensive state by state resource on the SAG.org website: SAG State-by-State Entertainment Law Index
An additional resource, that is slightly less reliable but a good starting point is from the Federal DOL (Department of Labor).
We have provided more detailed information related to some states. This includes recent legislative activity that may not be reflected on the resources above. Find information related to pending legislation here.