How is the china's one child policy monitored?

China's One-Child Policy was monitored through a combination of local government enforcement, community health workers, and a system of social incentives and penalties. Births were registered with local authorities, and families were required to obtain a birth permit before having a child. The government also employed technology, such as electronic records, to track population data and compliance. Violations could result in fines, loss of employment, or other social consequences.