You put your kid in the car and buckle them into their five-point harness. They’re six years old and start complaining that you’re treating them like a little kid. They’re old enough to ride in the car with a regular seat belt like a big kid, they protest. You consider letting them because they do look a little cramped in their child restraint system. Is it okay to let your toddler or small child ride in a vehicle using just a seat belt? No. Even though it might make your child happy, a seat belt won’t guarantee their safety.