What do women do to cause congenital deformities?

Seldom responsible: Most of the congenital deformities occur randomly. Some of them, e.g., fetal alcohol syndrome, neural tube defects associated with Folic Acid deficiency, can be caused by action or inaction of pregnant women. Women pregnant or planning to get pregnant should avoid alcohol abuse, maintain adequate nutrition, and receive prenatal cares as recommended by her obstetrician.