Multiple pregnancies following fertility treatments typically occur in 30% of women in whom more than one embryo is transferred. Worldwide, fewer than 20 countries have fully funded public fertility treatments, and many women utilizing assisted reproduction technologies are transferring more than one embryo for financial reasons because they consider it will be cheaper to have two embryos transferred in the one procedure. Yet, there is a large body of evidence for the poorer health, economic, and social outcomes for mother and baby from multiple pregnancies. Some countries have reduced the multiple pregnancy rate to less than 5% by linking the funding of ART to policies where the large majority of transfers are single embryos.

中文翻译：

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在辅助生殖技术中避免多胎妊娠：一次移植一个胚胎应该是常态

接受生育治疗后的多胎妊娠通常发生在 30% 的女性中，其中移植了一个以上的胚胎。在世界范围内，只有不到 20 个国家为公共生育治疗提供了全额资助，许多使用辅助生殖技术的妇女出于经济原因正在移植多个胚胎，因为他们认为在一个程序中移植两个胚胎会更便宜。然而，有大量证据表明多胎妊娠对母亲和婴儿的健康、经济和社会结果较差。一些国家通过将 ART 的资金与大部分转移是单胚胎的政策联系起来，将多胎妊娠率降低到 5% 以下。