March of Dimes silent on abortion as therapy

Not a
mention of abortion. This article says that
they always understate abortion.

And I never heard about "consanguineous marriage," the custom of Muslim men
marrying cousins or nieces.

More than 94 percent of serious birth defects occur in middle- and low-income countries, many of which lack basic programs to curb birth defects, such as improving maternal nutrition. By comparison, the United States has cut deaths from birth defects nearly in half since 1980 through a combination of prevention and treatments, especially surgery.

Perhaps by "treatments", they are including abortion.

Cultural practices also increase the rate of genetic disorders, the "Global Report on Birth Defects" found. Seven of the 10 countries with the highest birth defect rates are Muslim nations with a tradition of intermarriage of blood relatives, accounting for at least 20 percent of deformities there. In addition, the report said, the advancing average age of child-bearing women worldwide increases the risk of conditions such as Down syndrome.