A new study, published in the Journal of the American Medical Association, supports the practice of transferring one embryo at a time, as opposed to multiple embryos at a time. This study, which analyzed over 200,000 infants born over a 10-year period shows that twins and triplets are more likely to die prematurely and to require costly medical care compared to babies born as singletons. Often, couples struggling with infertility view twins as a desirable outcome because they feel twins would be a more cost effective way to achieve their desired family. This study offers additional proof of the health risks and economic consequences posed by multiple pregnancies.

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http://www.latimes.com/science/sciencenow/la-sci-sn-the-economics-of-ivf-20140915-story.html