Pregnant women occasionally smell pesticides for a short period of time generally have no effect on the fetus, but if a long time to smell pesticides will jeopardize the health of the fetus. Pesticides contain a large number of toxic substances, pregnant women, such as an occasional short-term smell of pesticides may cause dizziness, nausea and other symptoms, generally timely detachment from the pesticide odor of the environment, the symptoms will soon disappear, will not endanger the health of the fetus. However, if the pesticide smell during pregnancy for a long time will endanger the health of the fetus, long time smell of pesticides, toxic substances will be absorbed through the respiratory tract part of the body, which will pass through the placenta barrier into the fetus, resulting in fetal development deformities or miscarriage and other accidents, is not conducive to the eugenics of the child. It is recommended that pregnant women avoid contact with toxic chemicals during pregnancy, open windows in time after smelling pesticide odors, and avoid prolonged exposure.