Pregnant women are not recommended to point mosquito coils for mosquito repellent, because if inhaled by pregnant women may cause fetal malformations, developmental disorders and even premature abortion. 1. Fetal malformation: many mosquito coils contain formaldehyde and other toxic chemicals, these chemicals after combustion volatilized into the air, can pass through the respiratory tract, and then through the placenta into the body of the fetus, which may lead to fetal malformation. So during pregnancy, pregnant women are best to avoid contact with mosquito coils and their combustion after a series of toxic substances. 2. Developmental disorders: mosquito coils in the aromatic compounds may have an impact on the fetal nervous system and other developmental effects, if the pregnant woman inhaled may cause fetal developmental disorders, may lead to the birth of a child with mental retardation. 3. Premature abortion: mosquito coils may also contain a series of toxic substances with the role of stimulating maternal uterine contractions, which may lead to premature abortion. Pregnant women who want to repel mosquitoes during pregnancy can also use many other non-toxic methods. Pregnant women should pay attention to pregnancy health care, on-time maternity checkups, and avoid exposure to harmful substances. If a pregnant woman has been exposed to mosquito coils, don’t be too anxious, closely observe the situation of yourself and the fetus in the womb, and seek medical attention in case of any abnormalities.