It might just be my personal experience, but I am German and my personal birth rate has been steady all my life.
To add anything of substance here, there’s a good ol Kurzgesagt video on this. TLDW: Global phenomenon, hard to predict, just investing more money on parents and their needs has been tried and did not really work. Governments should still try to ease the burden of new parents because Jesus Christ they have it hard enough.
Somewhere else I heard that maybe our pessimistic look at the future is to blame and we should try to spread optimism more (or lay the foundation for a better future so people can actually be optimistic), but that’s less well researched. Not least because optimism isn’t easily quantifiable.
“Will no one rid me of this turbulent priest?”