<<I have read about a study that showed that women with morning sickness had
more successful pregnancies statistically. I have also read speculation that
morning sickness is a benefit because when the fetus is most vulnerable, the
early stage of pregnancy, morning sickness increases the woman's sensitivity
to potential fetal toxins including those found naturally in food.>>

Wow.  That was not my experience.  I had morning, noon, and night sickness
throughout the pregnancy.  It was so bad that I was unable to eat. The only
thing I recall eating is chicken soup. My son was born prematurely, weighing
3 lbs. 13 oz.  I gained 3.5 lbs. during the pregnancy and lost 33 lbs. upon
having him.  The complications were placenta previa and premature separation
of the placenta from the uterine wall.

I know the night I became pregnant.  I got sick the next morning and didn't
stop until the day I had him.

Siobhan