Attempts at child labor reform continued, aided by the widespread publicity from Hine's photographs. As a result, many states passed stricter laws banning the employment of underage children. In 1938, Congress passed the Fair Labor Standards Act, better known as the Federal Wage and Hour Law. The Act was declared constitutional in 1941 by the U.S. Supreme Court.
The Act set a work week of 40 hours, with a minimum wage of 40 cents per hour. It prohibited child labor under age 16 while allowing minors 16 and over to work in non-hazardous occupations. The Act set 18 as the minimum age for work in industries classified as hazardous. No minimum age was set for non-hazardous agricultural employment after school hours and during vacations. Children aged 14 and 15 could be employed in non-manufacturing, non-mining, and non-hazardous occupations outside of school hours and during vacations for limited hours.
Not sure what it was before the act. I guess they could give the kids what they wanted to.