Carl Haub
Carl Haub
birth cold early indoors late peak people rates spend statistics summer time
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.
access both century decline dramatic economic family fertility improved reality trends
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.