My husband is an only child. My mother in law received criticism for that fact, though early in their marriage they were poor and later on health prevented having more children. It was painful to explain WHY, but necessary because of the social pressure.
Today, the only children families don't face the same pressure because average family size is 2 - and because they have ONE child, they at least created a family. The criticism is now much harsher for the large minority of educated women who have not had any children at all.