The native European populations tend to have a lower-than-replacement birth rate. Actually, what we call The West has meager population gains compared to some other parts of the world. So, not every country needs that one-child policy. The regions that do -- mostly Asia and Africa -- average a lot more kids per couple than Western societies do, and for various reasons. Since Europe leads the world in suppressing its reproduction, I think Europeans would be the logical ones to show these countries with high birth rates how to decrease theirs.