It doesn’t really, it’s just that human activity on the internet is more and more taking place on platforms without any search indexing. 20 years ago, internet forum are where you’d go for advice online. Nowadays, it’s more and more becoming discord servers and similar, which just aren’t indexed by internet search.
The chance that Google, for some reason, wants people to have babies, is significantly lower than the chance you just happen to fit some demographics cohort which is likely to have a baby, or to soon have a baby.