Baby Car Seat Safety: Choosing, Fitting and Using It Correctly
How to choose an appropriate seat, fit it and the baby, and avoid the most common mistakes.
Before you use this guide: This is general educational information, not an individual medical assessment. We do not identify a clinician reviewer on this page, so please confirm personal health decisions with your doctor, midwife or paediatrician.
A properly fitted car seat is one of the most effective ways to protect your baby in a crash. Rules and standards differ between countries, so check the law where you live and always follow your seat's manual.
Choosing a seat
- Choose a seat that meets your country's approved safety standard and suits your baby's age, weight and height.
- Newborns should travel in a rear-facing seat. Keep your child rear-facing for as long as possible, up to the seat's limits. Many authorities advise at least until two years old, and local rules vary.
- Check that the seat fits your car. Try it in the car before buying, if you can.
- Buy new where possible. A second-hand seat should be used only if you know its whole history, it has never been in a crash, it is not past its expiry date, and it has all its parts and the manual.
Fitting the seat
- Install it exactly as the manual describes, with either the seat belt or the ISOFIX/LATCH system.
- Once installed, the seat should not move more than about 2.5 cm (1 inch) from side to side at the belt path.
- Never put a rear-facing seat in the front seat with an active airbag.
- Many local fire services, road safety services and retailers offer a free check by a trained technician.
Harnessing your baby
- For a rear-facing seat, the shoulder straps should come from at or just below your baby's shoulders. Follow the manual for forward-facing seats.
- The harness should be snug. You should not be able to pinch any webbing at the shoulder.
- Position the chest clip at armpit level, if your seat has one.
- Do not dress your baby in bulky coats or snowsuits under the harness. Buckle them in with thin layers and put a blanket over the top.
- Do not add inserts, covers or toys that did not come with the seat.
Using the seat day to day
- Never leave your baby alone in the car.
- Limit time in a car seat. Take breaks on long journeys, at least every couple of hours, so that your baby can lie flat and move about.
- Do not use the car seat as a regular place to sleep outside the car. A flat, firm sleep surface is safer.
- Keep an eye on your baby in the mirror, and pull over safely if you need to attend to them.
After a crash
Replace the seat after a moderate or severe crash, and follow the manufacturer's and local authority's guidance for minor ones, since damage may not be visible. Also replace it when it reaches its expiry date.
Trusted resources to read next
These public health resources provide additional information. Guidance can vary by country, so prioritise advice from your own care team and local health service.
- CDC: Helping babies sleep safely — Safe sleep environment recommendations for babies.
- NHS: Early days — Newborn checks, feeding, and support during the first days.
This content is for general information only and is not medical advice. Every pregnancy and every baby is different. Always talk to your doctor, midwife or paediatrician about your own situation, and seek urgent care if you are worried.