If you go here You will see this:
The Federal Fair Labor Standards Act (FLSA)
Except where there are specific exemptions, the employment of workers under age 18 is regulated by the FLSA. But the FLSA applies only to employees engaged in commerce. This means that volunteer work, such as fund-raising and sales for nonprofit charities, as well as school activities that meet the technical criteria constituting bona fide educational training experiences (as distinct from providing labor), are not covered by federal child labor laws.
Occupational Provisions
Under age 14
If an employment relationship exists, the only non-agricultural work activities lawfully permitted to those under age 14 are those that are exempt and therefore not covered by the FLSA. These include working for one’s parents in occupations other than manufacturing, mining, or Hazardous Occupations. Those employed as domestic laborers in and around their employers’ homes, as well as actors or performers in movies, theaters, radio or television productions and children who deliver newspapers to the consumer are also exempt.