Snow Babies

I found this article on BBC's website. http://www.bbc.co.uk/news/magazine-21537988

It is about how we in Scandinavia let our babies sleep outside even if it is very cold.
I understand that to many people it could sound like madness to let your baby sleep outside when it is
-10C.
Like many other Swed's I think it is good for them. They need the cold fresh air to fight germs. I let Sofia sleep outside, she is out there in the cold right now having her morning nap. The temperature is
-6C.

She is dressed warm and wrapped up in her sheepskin sleeping bag only her little face is poking out.

I wonder why not more parents in England do it? 

Is it just a cultural thing or has it got something to do with the weather conditions? 

What do you think? What do parents in other countries do?

Please let me know your thoughts.