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Something stinks about reproductive medicine in Southern California, and it doesn't involve eight dirty diapers.

Recently, the Los Angeles-based Fertility Institutes announced that it would soon be offering patients at its clinics the chance to choose traits such as "eye color, hair color and complexion." The clinics already offer gender selection to patients undergoing in vitro fertilization.

The Fertility Institutes employs a technique known as "preimplantation genetic diagnosis," which allows doctors to screen embryos soon after they are created in a petri dish and implant only the ones that meet certain criteria. The technique was invented to help high-risk families avoid or manage potentially deadly genetic traits, and to help women who've had multiple miscarriages conceive babies they can carry to term.

Now the Fertility Institutes is corrupting this lifesaving clinical procedure by using it to help families create designer babies, and I worry that their excesses will turn public sentiment against all preimplantation genetic diagnosis. That would be wrong.

My son, Henry, was born with a rare and fatal genetic disease, Fanconi anemia. Fanconi patients are born with faulty...