Sometimes, the only solution is to install an additional safety belt from an auto dealer or to obtain a tether kit. Read the owner's manual 10. A child should weigh more than 40 pounds before graduating to a belt positioning booster car seat. A shoulder belt should never be under the arm, behind the back or across the face and neck. Lap belts should be worn low and snug on the hips and not across the stomach.
Severe injuries can occur as a result of improper safety belt positioning.
Harness straps should be routed above the strength bar on the convertible seat in the forward-facing position. See car seat instructions for details. When the middle of the ears are even with the top of the vehicle seat back, there is inadequate head and neck support in a rear-end collision. A high back booster provides the best protection after your child outgrows a convertible car seat. A child who has outgrown his convertible seat, yet weighs less than 40 lbs.