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Lower birthrates could as easily be attributed to lower infant mortality catching up to a new generation https://www.cdc.gov/mmwr/preview/mmwrhtml/figures/m483

• User23 8y ago
  The decrease in births is twice the decrease in infant mortality according to the sources we both linked. Also, it takes at least a generation before lowering infant mortality lowers birth rates. It does look like lowered infant mortality contributed quite a bit to the baby boom.