Booster Seat Transition: Age, Weight, Fit & Installation Checklist

Readiness Criteria (AAP/NHTSA)

• Age: ≥4 years (preferably ≥5)
• Weight: ≥40 lb (18 kg)
• Height: ≥35 in (89 cm)
• Maturity: Sits still, keeps belt positioned correctly entire ride.

Booster Selection

• High-back preferred for vehicles without head restraints or for sleeping support.
• Must position lap belt low on hips/thighs, shoulder belt across mid-chest/shoulder (not neck).
• FMVSS 213 label; check NHTSA ease-of-use ratings.

Installation & Use

1. Place in rear seat (safest).
2. Route vehicle belt per manufacturer guide; lock retractor if needed.
3. Child sits all the way back; belt flat, snug, no slack.
4. Teach child: “No tucking shoulder belt under arm or behind back.”

Graduate to seat belt alone when child passes 5-step test (typically 4'9", 8–12 yrs).