View Here : Washington State Car Seat Laws
The car seat should have a label stating it meets or exceeds Federal Motor Vehicle Safety Standard 213. A five-point harness will protect your child better than a three-point harness. To determine the car seat’s ease of use, check the National Highway Traffic Safety Administration’s (NHTSA) five-star ease-of-use standards. A car seat that has earned four or five stars should have clear instructions and be easy to use.
The penalties for child safety seat and adult seat belt violations are as follows: For Child Safety Seat Violations. The penalty for violating DC's child safety seat law is a fine of at least $75 and two points on the driver's license. This applies to any person operating a motor vehicle in the District of Columbia.