Auto-genocidal/Post-modern culture treats children as an expensive and peculiar hobby, something like a curious fashion statement. Children are, after all, expensive, messy, and they interfere with an active dating life. And if children are seen as a mere fashion accessory or an emotional indulgence, then one will do just as well as two (and much better than three or four). This attitude reveals itself in the demographic statistics of all societies that have adopted post-modernism. Across the Western world (and some unfortunate parts of Asia), there has been a catastrophic collapse in birthrates. Over the next few decades, parts of Europe may see their populations fall in half.
Organic culture views children in a radically different fashion, which was summed up brilliantly by Oswald Spengler in his seminal The Hour of Decision:
A woman of [tribe] does not desire to be a "companion" or a "lover," but a mother; and not the mother of one child, to serve as a toy and distraction, but of many: the instinct of a strong tribe speaks in the pride that large families inspire, in the feeling that barrenness is the hardest curse that can befall a woman and through her, the tribe. Out of this instinct arises the primitive jealousy, which leads one woman to take away from another the man whom she covets as the father of her children. The more intellectual jealousy of the great cities, which is little more than erotic appetite and looks upon the other party as a means of pleasure, and even the mere fact of considering the desired or dreaded number of children who are to be born, betrays the waning of the tribal urge to permanence; and that instinct for permanence cannot be reawakened by speeches and writing. Primitive marriage...was anything but sentimental. A man wants stout sons who will perpetuate his name and his deeds beyond his death into the future and enhance them, just as he has done himself through feeling himself heir to the calling and works of his ancestors.