Foreign language for children

I remembered how I was in the summer with relatives. They have two children. They emigrated to Germany. For me it was surprise when I saw what the kids watch cartoons in a foreign language and understand what it says. Although they moved only 8 months ago. Children 3 and 6 years.
In fact, this same method Steve “listen more”
I read Russian forums to find out whether we have used this method. It turned out that many parents believe that the language should be taught in school, even with children.
I’d like to know whether to apply the method of “cartoons in a foreign language” in your country, you have a family or family with your friends.