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About 80 to 90% of women suffer nausea at some point during their pregnancy. Although it's called "morning sickness" it can strike at any time. While it usually persists only during the early weeks, up to 30% of women can suffer with nausea beyond 20 weeks or even up to delivery.
It can be a serious problem for both mother and baby. Health conscious women do not want to take the risk of pharmaceutical drugs. They can cross the placenta barrier and have harmful effects on the child. But extended bouts of nausea can leave an expectant mother malnourished. That can lead to low birth weight or a preterm birth.