Demographic momentum is such that you can't simply change something overnight. Whatever goal you might set, you have to start doing something about it about a generation ahead of time.

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The reality is that both trends are occurring. The dramatic fertility decline during the 20th century coincided with improved health, access to family planning, economic development, and urbanization.

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Our birth rates nationally peak in late summer and early fall. People spend a lot more time indoors in winter, especially in the north, because it's cold outside. The statistics don't lie.

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