I generally like and respect Mary Harrington, although I often disagree with her. This is a bit of a tired take on why she thinks the young'uns aren't having enough bebbehs: https://unherd.com/2023/05/why-gen-z-prefer-dogs-to-babies/
Jordan Peterson said something similar a while ago, and I wrote this in response:
https://blog.ninapaley.com/2022/10/04/deluded-and-immature/