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Human population renewal starts with births. Since births can happen at any time in the year and over a wide range of ages, demographers typically imagine the birth series as a continuous ow. Taking this construct literally, we visualize the Swedish birth series as a ow. A long birth series allows us to juxtapose the children born in a particular year with the children that they in turn had over the course of their lives, yielding a crude notion of cohort replacement. Macro patterns in generational growth dene the meandering path of the ow, while temporal booms and busts echo through the ow with the regularity of a pulse.

Boom, echo, pulse, flow: 385 years of Swedish births