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What percentage of births are twins?
~1.6%
What percentage of births are twins?
About 1.6% of all births worldwide result in twins — roughly 1 in 63 births. The rate has nearly doubled in wealthy countries since 1980, largely due to IVF and fertility treatments. Natural identical (monozygotic) twinning occurs spontaneously in about 1 in 250 pregnancies.
Source: Monden et al. (2021), Human Reproduction