Child labour in Germany was first regulated in 1839 when Prussia passed a law prohibiting factory employment of children under 9, limiting teens under 16 to 10-hour work days, and banning night and Sunday work for children. While rural children always worked for their families, poor urban families relied on children's wages, though the new law was an initial step to control child labour. The law was notable as the first of its kind in Europe but critics argue it had weak enforcement and limited restrictions.