Missouri law mandates that children under the age of 4 be transported in a child safety restraint system (210.104, RSMo); it is recommended by the National Highway and Traffic Safety Administration (NHTSA) that children 4 and over but under 40 pounds also be transported in a child safety restraint system.

In transporting early childhood students, it is recommended that a school district follow the recommendations of NHTSA (https://www.nhtsa.gov/school-bus-safety/child-safety-restraint-systems-csrs-school-buses-national-training).