After my trip to Switzerland, I search any information about this issue and I learned something about this issue. You can check the link: http://www.bbc.com/news/magazine-29765623
https://www.quora.com/Is-it-true-that-Heidi-the-cartoon-character-represents-the-slave-childworkers-in-Switzerland
I am waiting your research and your blog. It will be interesting.