People who choose to remain childfree are often stigmatized by society. Why are they stigmatized by society.

what are the cultural and structural factors.

I searched Google under the key words "Childlessness critique" to get these possible sources:

http://www.google.com/search?client=safari&rls=en&q=Childlessness+critique&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.