Yeah, it's just what they're used to. I'd imagine a lot of those people already come from big enough families. Thinking with England in mind, there was a huge baby boom following the Blitz in London, and a lot of the children from that time are grandparents now. Who, even with birth control being a thing, might still have decided to have their own large families even with better housing than their parents did. And so on and so forth to the current generation of people having children.
Thank you, Jennifer Worth for providing a massive infodump of family life in London's East End in the late 50's.
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