Car Seat Guide by Age & Weight

The AAP recommends keeping your child rear-facing until they reach the maximum weight or height allowed by their car seat manufacturer — not simply at age 2. Many convertible seats allow rear-facing up to 40–50 lbs. Rear-facing is significantly safer for young children because it distributes crash forces over the entire back, head, and neck rather than concentrating them on the harness straps.

An infant-only seat is a small carrier designed for newborns through about 22–35 lbs, used rear-facing only. It has a detachable base and is easy to carry. A convertible seat stays in the car and can be used rear-facing first (up to 40–50 lbs on most seats) then converted to forward-facing with a harness (up to 65–80+ lbs). Convertible seats extend the rear-facing period and are more cost-effective long term.

Switch to a booster when your child has outgrown the forward-facing harness seat by height or weight — not before. Most harness seats accommodate children up to 65–80 lbs. Switching too early to a booster means your child loses the protection of the 5-point harness, which is more protective than a seat belt alone in crashes.

Keep your child in a booster seat until they are 4'9" (57 inches / 145 cm) tall AND the seat belt fits correctly without the booster — meaning the shoulder belt lies across the center of the chest and shoulder (not the neck), and the lap belt lies across the upper thighs (not the belly). This usually happens between 8 and 12 years old, depending on the child's size.

It depends. Never use a car seat that has been in a crash (even a minor one), is past its expiration date (usually 6–10 years from manufacture, printed on the seat), or has any missing/damaged parts. If you don't have the full history of the seat, it's best to buy new. Car seats are one area where saving money carries real safety risk.

Yes. Car seats are always the safest option regardless of vehicle type. In a taxi or rideshare, bring your own car seat when possible. For occasional travel without a seat, riding in the back with a seat belt is safer than the front. Some rideshare services (like Lyft and Uber in major cities) offer car seat options for booking.