Couple days ago, news crossed the wire that Britain is planning to regulate the number of embryos implanted through in vitro fertilization after a surge in women having multiple births.
It seems like the US will push for a similar regulation. SART so far has recommended IVF clinics in the US to “self regulate” according to the guideline, not to transfer too many embryos. Currently the rate of high order multiple birth is about 25%.
The issue is 50% of human embryos (in general, not exclusive to ivf embryos) are genetically not normal, and the ratio declines with advancing age. So, to reassure the pregnancy rate, many clinics have transfered so..many embryos.
May be the answer to this question is PGD, Preimplantation Genetic Diagnosis, whereby, the embryos are screen genetically, prior to transfer.

At XPert Fertility Care, PGD is offered free to our patients with the purpose to further reduce the risk of multiple births.