however , mothers who had one affected child appeared to be at much higher risk for having subsequent affected children ( 9 of 10 ) if phenytoin use was continued through future pregnancies than were mothers whose first-born child was unaffected despite being exposed to phenytoin during the pregnancy ( 5 of 52 among all families , or 1 of 48 when only children exposed throughout the entire pregnancy were included ) .
C0031507
phenytoin
C0032961
pregnancy