These articles always seem a bit iffy when watching from the inside. Sure, I know plenty of immigrants who have raised concerns about the habit of leaving babies outside in the stroller during the winter, but the rest?

Children in other countries don't play or leave the house due to bad weather?

Indeed, the school doesn't start until they are six years old but that's because we just call it kindergarten (nowadays preschool) instead. They still have an official curriculum where they are expected to learn to interact, communicate, build a foundation for writing, and learn about nature. Among many other things.