Winter Coats and Car Seat Safety

Winter Coat Car Seat
Getty/Tanya Little

Thick winter coats or snowsuits can keep your baby warm but they can compromise your child's car seat safety. In order for a baby car seat or toddler booster seat to function properly, the straps need to remain tight against the child's chest. Winter coats and snowsuits change the way a child fits into the car seat. When the car seat straps don't fit the child properly, there is a chance the child could be ejected from the car seat.

Coat Compression Is Dangerous

The car seat harness needs to stay close to the child's body at all times. All coats and clothing will compress in a crash, but thicker winter coats and snowsuits could compress enough to create a lot of slack in the harness. The effect could be as though you never tightened the harness straps at all. Those loose straps may not be able to keep baby in the car seat, or in the car at all.

Keep Your Child Warm and Safe

Even if you can't safely use your child's winter coat in the car seat, there are ways to keep baby warm when temperatures drop.

  • Dressing in layers: Dress your baby or toddler in thin layers of clothing. Each layer holds in warm air. The layer next to the skin should be close-fitting, such as tights, leggings, long underwear, or a long-sleeved bodysuit. Cover this with pants and a shirt or sweater. Polar fleece jackets and snowsuits are warm but thin, making them a smart choice for a top layer. Dress your child in a hat, mittens, and warm socks or booties to keep head, hands, and feet warm. These won't interfere with the snugness of the straps.
  • Take off any coat before buckling the car seat: If your child is wearing a coat when you put her in the car, take it off. Once buckled into the car seat, you can put the child's coat on backward over her arms to keep her warm without compromising safety.
  • Add a blanket on top: Buckle the child into the infant seat, then cover her with a light blanket tucked around the sides. If needed, you can add another heavier blanket over the top of the infant seat. As the car heats up, you can remove a blanket so your child doesn't overheat.
  • Make sure nothing is behind the child's back. No portion of the blanket, jacket, or car seat cover should be behind your child's back.
  • Adjust the straps each time: You should only be able to get one finger under the harness at your child's shoulder bone. If you can pinch the strap, it is too loose.
  • Warming up before you go: If you can, keep the carrier portion of your infant seat indoors so it isn't cold when you put your child into it. Warm-up your car before putting the baby in the vehicle.

Check Winter Coats for Car Seat Safety

This test can show you that a coat or snowsuit might compress too much in a crash and why it is safer to use thin layers and a blanket over the car seat instead.

  1. Take the car seat into the house.
  2. Put the winter coat or snowsuit on the child.
  3. Put the child in the car seat and buckle the harnesses as you normally would before car travel. Adjust the straps to the appropriate fit for your child.
  4. Take the child out of the car seat without loosening the straps at all.
  5. Take the coat off your child.
  6. Put the child back in the car seat and buckle the harnesses again, but do not tighten the straps.
  7. If you can fit more than two fingers under the harness at the child's shoulder bone, the coat is too thick and is not safe for use with the car seat.

Check Car Seat Covers for Safety

Many companies offer thick car seat covers that act like a bunting for babies in the winter. Parents should avoid buying any car seat cover or car seat bunting that threads through the harness straps of their child's car seat. Often the packaging of these covers states that the product meets all federal car seat safety guidelines. However, there are no federal guidelines governing after-market accessories. These extra car seat covers and buntings could interfere with the function of the car seat harness, and many car seat manufacturers will void your car seat warranty if after-market accessories are used.

Winter car seat covers that fit over the top of the car seat like a shower cap or drape can usually be used safely. These should not have a layer under the child. Be sure the child's face is not covered.

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Article Sources

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  1. American Academy of Pediatrics. Winter Car Seat Safety Tips from the AAP. Updated February 6, 2019.

  2. McDonnell E, Moon RY. Infant deaths and injuries associated with wearable blankets, swaddle wraps, and swaddlingJ Pediatr. 2014;164(5):1152–1156. doi:10.1016/j.jpeds.2013.12.045