Japan and Demographic Crisis

Originally I was going to ask whether Japan is sort of the China of this world or not but the lore seems pretty clear that it isn't. Rather, that led me to wonder how they and more generally the industrialized world is dealing with the declining birthrates.

Are they better, are they worse, is America a childless country like Russia irl, is Japan doing better (have the left Wing governments at least softened the work culture that's a massive reason for not having children), are the developing countries having less children since most of them are at least a bit richer and that usually leads to a fall in birthrates?