Time limits in car seats: how long is too long?

Time limits apply no matter where the car seat is being used - in the car, on the pram, or even indoors. A car seat should only be used for travel, not as a convenient carry cot or nap space. It’s tempting to clip the seat onto a travel system for quick errands, but wherever possible, opt for the bassinet or pushchair seat unit instead. If you’ve invested hundreds (or even thousands!) in a pram, make sure you get your money’s worth from those parts!

Car seat = car, nothing more.

We all know how easy it is for babies to fall asleep in their car seat, especially during longer journeys. But while car seats are essential for travel, they’re not designed for extended periods of use. Spending too long in a seated position can pose real risks to a baby’s breathing and overall wellbeing - even if they appear comfortable or asleep.

Why time limits matter

When a baby is in a semi-upright position, their heavy head can fall forward, narrowing the airway and making it harder to breathe. This is known as positional asphyxia, and research shows it can occur within short periods - particularly in newborns and premature babies whose neck muscles aren’t yet strong enough to keep their airway open.

A study published in the BMJ Archives of Disease in Childhood and further research in The National Library of Medicine found that oxygen saturation levels in newborns can drop after just 30 minutes in a car seat. The NHS University Hospital Southampton’s “car seat challenge” also highlights that babies should not remain seated for long stretches, as it can impact their breathing and posture.

The article from Oklahoma State University explores similar risks, noting that while car seats are vital for road safety, they are not safe sleeping environments.

Recommended limits

Your baby’s age, size and developmental stage all play a role in how long they can safely stay in a car seat:

• Premature babies and newborns: remove from their seat at least every 30 minutes.

• Past the newborn stage: stop every 45 minutes and take the baby out for at least 15 minutes.

• Older babies and toddlers: gradually increase to around 90 minutes between breaks.

The commonly heard “two-hour rule” is often misunderstood. It doesn’t mean a child can stay in a car seat for two hours at a time - it means two hours including breaks, as shown above. Regular stops are essential, and short breaks every 30-90 minutes help protect your baby’s breathing and posture.

Axkid, one of the leading extended rear-facing brands, recommends 45 minutes in infant carriers and 90 minutes in car seats, which aligns closely with NHS and independent research findings.

Safe travel tips

If you’re planning a long journey:

• Plan regular stops. Build in breaks at least every 45-90 minutes so your child can stretch and lie flat.

• Avoid long overnight drives. If travelling far, consider splitting the journey with an overnight stay.

• Transfer baby to a flat surface once you arrive. Car seats, Doona’s and “lie-flat” models are not suitable for prolonged sleep.

• Never leave a child unattended in a car seat. Whether in the car or indoors, babies must always be supervised.

Even adults are encouraged to take a break from driving every two hours to reduce fatigue and improve blood circulation. If grown-ups benefit from moving regularly, it’s even more important for babies, whose airways and posture are much more fragile.

FAQ’s

Why can’t my baby sleep in a car seat once we’re home?

Car seats are designed for travel safety, not sleep safety. A firm, flat surface is the safest place for babies to sleep.

Do these limits apply to all types of seats?

Yes. The same guidance applies to Doona’s and so-called “lie-flat” seats, as none are truly flat for safe extended use.

What if my journey is longer than two hours?

Plan extra stops, allow time to feed, change and stretch your baby, or consider an overnight break. Trains and ferries can also offer more flexible travel options.

For more on safe travel and breathing risks, see resources from CAPT, Oklahoma State University, and NHS University Hospital Southampton.