- The smallest children also sleep outside and we make sure they are well dressed, says Merle Hagerrot, principal and preschool teacher at Lilla Bullerbyns preschool in Järna.

To keep the children warm, they usually gather and have coffee around the fire in the morning and then make sure that the children are moving, for example by going tailgating or going to the barn and feeding the animals.

- The coldest weather we have been out with the children in is around 20 degrees below zero, says Merle Hagerrot.

Start the clip to hear what the children like about being outside in the winter.