A national medical society is investigating whether a fertility doctor followed its guidelines when he implanted six embryos into a Southern California woman who gave birth to octuplets last month.

The American Society for Reproductive Medicine confirmed that it's investigating because Nadya Suleman says she received in-vitro fertilization for all 14 of her children at the same Beverly Hills fertility clinic.

Suleman, 33, told NBC's Today show that she was implanted with six embryos in each of her six pregnancies, resulting in four single births, a set of twins and the octuplets. No more than three embryos are considered the norm for a woman her age, and fertility experts and medical ethicists have been critical of the Jan. 26 birth of the octuplets.

The society has contacted Suleman and her doctor, and is prepared to assist the Medical Board of California, which is also looking into the pregnancy, the society's president, Dr. R. Dale McClure, said in a statement.

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