![]() In the latest issue of The Quarterly Review of Biology (Vol. That is the conclusion of two Cornell University evolutionary biologists who examined the outcomes of thousands of successful and unsuccessful pregnancies. Mother-model Mirka Pospisil delivered a healthy baby girl June 4, 2000.Īs unpleasant as it is, the nausea and vomiting of "morning sickness" experienced by two-thirds of pregnant women is Mother Nature's way of protecting mothers and fetuses from food-borne illness and also shielding the fetus from chemicals that can deform fetal organs at the most critical time in development. Thereafter the frequency declined gradually. The incidence of NVP symptoms increased until weeks 9-14, when 60-70 percent of the women experienced nausea and 30-40% vomited.
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