I do not know, if it is really true, it is just how I perceive it here in Germany. Seems plausible taking into account, that Germany both has the second lowest

I do not know, if it is really true, it is just how I perceive it here in Germany. Seems plausible taking into account, that Germany both has the second lowest birth rate worldwide and a relatively large middle class. You can see the social status as a vector of social indicators that together define which class you belong to. The "> 3 kids" indicator assigns or strengthens your assignment to a class, depending on which other indicators you have.