Probability of Having Triplets
1 in 1,149
Per-event probability in US
About 1 in 1,149 births in the US results in triplets or higher-order multiples, though this rate has declined with changes in IVF practices.
The rate of triplet and higher-order multiple births in the United States is approximately 87 per 100,000 live births, or about 1 in 1,149. This rate has actually been declining since its peak in 1998, primarily due to changes in assisted reproductive technology practices that now transfer fewer embryos per IVF cycle.
Natural triplet conception (without fertility treatments) is very rare, occurring in roughly 1 in 8,000-10,000 pregnancies. The vast majority of triplet pregnancies result from fertility treatments, either IVF (in vitro fertilization) or ovulation-stimulating medications like clomiphene. Risk factors mirror those for twins: maternal age over 35, fertility treatment use, and family history.
Triplet pregnancies carry significantly higher risks than twins or singletons, including very premature birth (average delivery at 32-33 weeks), very low birth weight, and increased maternal complications. Many fertility specialists now advocate for single embryo transfer during IVF to minimize the risk of multiple pregnancies while maintaining good success rates.
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