When I was a child in the 1960's, it was not uncommon to have friends with 5 or 6 siblings. I was one of 4.
But, times have changed. For all sorts of reasons - economic, work, personal preference, religion - the majority of parents are having fewer children today than was common in the previous generation. And, as family size has decreased, societal attitudes about larger families have become increasingly negative. The usual reaction goes something like this: "Why would you want to have so many kids?" Or, people might not ask at all and assume insanity or religious zealotry.