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Hey researchers, bloggers, everyone interested in fertility data! We recently added lots of new data at Our World in Data on fertility rates, ages at childbirth, twin birth rates, birth seasonality, and more. Here's a thread of what you can find on the site! 🧵

Our new data comes from a range of sources including the Human Fertility Database, the UN World Population Prospects, the Human Multiple Births Database, the Human Mortality Database, and more.

The total fertility rate is commonly interpreted as a prediction of how many children women will have on average over their lifetimes. But it doesn't necessarily tell us that. I've written about why in a recent article:

The completed cohort fertility rate. This is a measure of the eventual number of children born per woman by the end of her childbearing years. You can see that it's given by the woman's birth year, and is estimated *after* they complete their childbearing years. ourworldindata.org/grapher/coho...

Are women having fewer children, more likely to have no children, or both? You can explore the data on the share of women who have had a given number of births. We can see that two is the typical number of children in many high-income countries. ourworldindata.org/grapher/shar...