After 8 hours of insecticide spraying, pregnant women can enter the room, it is best to open the window to ventilate. Insecticides contain a lot of toxic substances, such as ichthysanone, chlordane, etc., although these substances can kill pests, but also on the pregnant woman and the fetus will cause damage, may affect the normal development of the fetus, and even lead to the occurrence of deformities. After spraying insecticides, you need to open the windows in time to ventilate the room, waiting for the harmful substances to completely evaporate and dissipate before allowing pregnant women to enter the room, it is best to dry thoroughly for more than 8 hours of time is more secure, as far as possible to minimize the impact on the fetus. Pregnant women’s physical condition is relatively special, need to avoid contact with insecticides and other chemicals, if the room after spraying insecticides fully dry, pregnant women into the room after the dizziness, nausea and other symptoms of discomfort, it is best to consult a doctor in a timely manner.