Fertility Treatments Lead to Twins: Understanding the Risks & Chances

Fertility treatments like IVF and IUI increase the likelihood of twins, triplets, or more by up to 30%. The risk depends on factors such as embryo transfer numbers and ovulation-stimulating drugs. While multiple pregnancies can arise naturally, assisted reproductive technologies significantly elevate these chances, especially with multiple embryo transfers.

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Key Takeaways

IVF Embryo Transfers and the Risk of Fraternal Twins

Transferring two or more embryos during IVF increases the chance of fraternal twins if both implant. Even single embryo transfers can result in identical twins if the embryo splits, though this occurs in less than 1% of cases. The number of embryos transferred directly correlates with multiple birth risks.

IUI and Ovulation-Stimulating Drugs: Higher Multiple Births

Intrauterine insemination (IUI) combined with drugs like Clomiphene citrate or gonadotropins can lead to multiple egg release, increasing the risk of twins. These medications stimulate ovulation, sometimes causing more than one egg to fertilize and implant.

Health Risks of Multiple Pregnancies from Fertility Treatments

Multiple pregnancies carry higher risks of preterm birth, low birth weight, preeclampsia, and placenta previa. Babies may also face cerebral palsy or birth defects. Medical institutions recommend single embryo transfers to mitigate these risks, though many opt for multiple transfers to boost pregnancy success rates.

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