| Safety certification | Check the restraint’s labels and instructions for compliance with the safety standards that apply where you live. In the United States, look for the statement that the child restraint conforms to all applicable Federal Motor Vehicle Safety Standards. | The required certification statement is present, legible, and consistent with the product’s instructions and intended use. | Certification indicates that the restraint is intended to meet applicable regulatory requirements. It does not, by itself, confirm that the booster will fit a particular child or vehicle. |
| Child’s size and readiness | Check the booster’s manufacturer-specified height and weight limits. Confirm that the child can sit upright without leaning, slouching, or moving the belt out of position during the ride. | The child is within the booster’s stated limits and can maintain the correct seating position for the whole trip. | Correct belt positioning depends on both the booster and the child’s ability to remain properly seated. |
| Lap-belt position | Buckle the child in and inspect where the lap portion of the belt rests. | The lap belt lies low and snug across the hips and upper thighs, not across the soft abdomen. | A properly positioned lap belt helps keep the restraint on the stronger hip and thigh area. |
| Shoulder-belt position | Check the belt’s path across the child’s upper body. Use a belt guide only as directed by the booster’s instructions. | The shoulder belt crosses the middle of the chest and shoulder. It does not cut across the neck or slip off the shoulder. | The belt must stay correctly positioned to restrain the upper body in a crash. |
| Vehicle belt type | Confirm that the seating position has a lap-and-shoulder belt and that the belt can move and retract as intended. | The booster is used with a lap-and-shoulder belt, and the belt is not twisted, trapped, or blocked by the vehicle or booster. | Boosters are designed to position a lap-and-shoulder belt. Do not use a booster with a lap-only belt. |
| Seat depth and knee bend | Have the child sit with their back against the vehicle seat and check where the seat edge meets their legs. | The child’s knees bend comfortably at the edge of the vehicle seat while their back remains against the seatback. | A comfortable sitting position makes it easier for the child to stay upright and keep the belt correctly placed. |
| Head and back support | Check the booster and vehicle seat instructions for head-support requirements. For a backless booster, confirm that the vehicle seat or head restraint supports the child’s head. | The child’s head is supported, and the booster sits securely on the vehicle seat without interfering with the head restraint. | Suitable support and compatibility help the child sit comfortably and allow the booster to be used as intended. |
| Booster stability and vehicle fit | Place the booster in the intended seating position and check for interference with the seat cushion, seat contours, buckles, or adjacent restraints. | The booster rests flat and stable, and the child can buckle and unbuckle without the belt being trapped or misrouted. | Vehicle seats and belt systems vary. A booster that works in one seating position may not fit another. |
| Backless or high-back design | Choose a design that works with the vehicle’s head support, belt geometry, and the child’s comfort. Follow the instructions for the specific restraint. | The selected type provides the required support and keeps both portions of the belt correctly positioned in that vehicle. | Neither design is automatically the best choice for every child and vehicle; proper fit and correct use are essential. |
| Expiration, damage, and instructions | Check the restraint’s labels and manual for its useful-life limit, cleaning guidance, and restrictions. Do not use a damaged restraint or one with missing instructions. | The booster is within its stated service life, has no visible damage, and can be used according to its instructions. | Materials, components, and usage requirements vary by product. The manufacturer’s guidance determines the restraint’s limits. |
| Back-seat use and local laws | Check current child-passenger laws for your location and the vehicle manual’s seating-position guidance. | The child uses an appropriate rear seating position whenever possible, and all local requirements are followed. | Age, height, and restraint requirements differ by jurisdiction. A general guide cannot replace local law or vehicle instructions. |