Whether or not Nevada law requires that your child be restrained in a car seat depends on their weight and age. State law mandates that if your child is under 6 years of age and weighs 60 pounds or less, they must be in an appropriate child safety seat. Under Nevada Revised Statute 484B.157 the child restraint system must be: Approved by the U.S. Department of Transportation (DOT) in accordance with Federal Motor Vehicle Safety Standards (FMVSS) law; Appropriate for the weight and size of the particular child; Installed and attached safely in a car according to the manufacturer’s instructions or in a manner approved by the National Highway Traffic Safety Administration (NHTSA).