TL;DR The world is getting older, hence less babies born.
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Downvote? For quickly summarizing a wikipedia link? I guess we all have time to waste skimming wikipedia articles, don't we?
The problem is that it's wrong.
A better summary would be, "The world is getting richer, hence lower infant mortality, hence birth rates drop."
The world is graying extremely quickly (Japan, Western Europe, the US, and soon China).