LOS ANGELES — California medical officials revoked the license of the fertility doctor who helped "Octomom" Nadya Suleman become the mother of 14 children through repeated in vitro treatments, according to a decision made public Wednesday.

The Medical Board of California said it was necessary to revoke Dr. Michael Kamrava's license to protect the public. The revocation takes effect July 1.

The Beverly Hills fertility doctor has acknowledged implanting 12 embryos into Suleman prior to the pregnancy that produced her octuplets. It was six times the norm for a woman her age.

That was a mistake, according to the board.

"While the evidence did not establish (Kamrava) as a maverick or deviant physician, oblivious to standards of care in IVF practice, it certainly demonstrated that he did not exercise sound judgment in the transfer of twelve embryos to (Suleman)," the board said in its 45-page decision.

Since Suleman's octuplets were born in January 2009, the medical community and public have puzzled over how a doctor could have implanted so many embryos into a patient and how the babies were carried to premature birth.

In practice, fertility doctors avoid mega-births, as high number multiple births are sometimes called, because the process can put the mother at risk for serious complications and death. Crowding in a mother's uterus could also result in premature birth, cerebral palsy, developmental delays or other health problems for the babies.

To date, Suleman's octuplets are the world's longest surviving set.