Daytime temperatures this winter in Stockholm have regularly dropped to -5C (23F) but it's still common to see children left outside by their parents for a sleep in the pram.
Wander through the snowy city and you'll see buggies lined up outside coffee shops while parents sip on lattes inside.
And if you are visiting friends and your child needs a nap, you may be offered the garden or balcony instead of a bedroom.
I think it's good for them to be in the fresh air as soon as possible, says Lisa Mardon, a mother-of-three from Stockholm, who works for a food distribution company.
Her children have been sleeping outside since they were born.
Nowadays most day-care centres in Sweden put children outside to rest. It's common to see rows of prams lined up in the snow at nap-time, with youngsters fast asleep inside.
At Forskolan Orren, a pre-school outside Stockholm, all children sleep outside until they reach the age of three.
When the temperature drops to -15C (5F) we always cover the prams with blankets, says head teacher Brittmarie Carlzon.
It's not only the temperature that matters, it's also how cold it feels. Some days it can be -15C but it actually feels like -20C (-4F) because of the wind, she says.
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Would you put your baby or toddler outside in the freezing cold for their lunchtime nap?
