Even firstborn children, it is now well established that there is a slight IQ difference. But I don't think there's a lot of evidence for firstborn or only children being higher or lower in any kind of dramatic way on any personality trait or unhappiness either. So I don't know if we gave Ian anything even remotely useful. Well, he can't make a podcast, dammit. Let me just annotate a bit your observation or your understanding. My screed, my rant.
Why have fertility rates dropped so dramatically? Do fathers or mothers get more happiness from parenting? And how does birth order affect a child’s future?