The design and manufacture of car child seats must comply with strict safety standards and regulations. These standards are designed to ensure that seats provide maximum protection to children in the event of a vehicle crash. For example, in the United States, child seats are required to comply with the Federal Motor Vehicle Safety Standard (FMVSS), while in Europe seats are required to comply with ECE R44/04 or i-Size (R129) standards. These regulations specify the structure, materials, installation of the seat, and the crash tests that must be passed to ensure their safety.