Around here we have a custom of letting your kid have a nap in the baby wagon outdoors, even in winter. I guess people started using baby monitors for that by now. When I was small, mum just left a window a bit open (1970-ish Sweden).
This is even done at daycare down to -15 degrees C. However they do have someone present next to the kids at most times.
There are lots of stories of swedish people going to USA and getting arrested for leaving their kid without supervision outside while being 5 meters away inside a store for five minutes. We are used to a bit more relaxed way of parenting I guess :-)
I'm in Finland (although not Finnish), and we did the same thing. Putting the pram on the balcony, while the child was asleep. We'd usually leave the door partway open so we could hear if he cried.
But to be honest once he was having a nap he was generally predictable, and quiet. Especially the lunchtime naps after food - we knew he'd be absolutely fine asleep for 90 minutes and then he'd probably wake up. On a long day he'd sleep for two hours, but that didn't happen so often.
Interesting reading for people in other parts of the world:
This is even done at daycare down to -15 degrees C. However they do have someone present next to the kids at most times.
There are lots of stories of swedish people going to USA and getting arrested for leaving their kid without supervision outside while being 5 meters away inside a store for five minutes. We are used to a bit more relaxed way of parenting I guess :-)