1.   But the Food and Drug Administration says this commercialized use of ultrasound imaging may be exposing fetuses to unnecessary risks.

2.   Dr. Doyle is steadfast in her belief that exposing a fetus to alcohol is tantamount to child abuse.

3.   It could just be the bad luck of exposing a fetus to a teratogen, or birth defect-inducing substance, at exactly the wrong time.

4.   So women who inherited that defective enzyme and did not get large amounts of folic acid would be exposing their fetuses to the dangerous substance homocysteine.