Is it safe to let a baby nap in a car seat for hours?
Not ideal. Besides positional risks, long naps in a warm car seat increase flame retardant transfer.
What's actually in it
Car seat foam and fabric typically contain organophosphate flame retardants to meet federal motor vehicle standards. A sleeping baby in a warm car seat generates sweat that speeds chemical transfer to skin.
There's also a positional safety concern: long naps in a car seat outside the car can cause breathing problems. Pediatric guidance is to move a baby to a flat surface for naps over 30 minutes when possible.
What the research says
A 2025 study in Sci Total Environ showed sweat amplifies flame retardant transfer from kids' textiles.
Use a flame-retardant-free car seat (UPPAbaby, Nuna, Clek offer specific models). Move baby to a flat sleep surface for long naps.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Sweat-amplified dermal transfer of PFAS and OPEs. | Sci Total Environ | 2025 |
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