If pregnant women occasionally use electric mosquito coils are generally not harmful to the body, if pregnant women long-term use of electric mosquito coils may be harmful to the body, but also affect the fetus. Electric mosquito coils are the use of steam evaporation of pyrethroids in the paper to kill mosquitoes, electric mosquito coils are harmful to pregnant women need to be judged on a case-by-case basis. If pregnant women occasionally use electric mosquito coils, due to inhalation of harmful substances is relatively small, usually not harmful to the body. If pregnant women in a closed environment for a long time in contact with electric mosquito coils may be harmful to the body, some pregnant women will have a headache, sore throat, nasal congestion and other adverse reactions, and pregnant women with long-term use of electric mosquito coils will not only be harmful to their own harmful, but also may affect the development of the fetus. Pregnant women with electric mosquito coils will be harmful, need to be based on the frequency of use and inhalation of harmful substances to judge. It is recommended that pregnant women should avoid the use of electric mosquito coils, usually by installing mosquito nets, screens and other ways to repel mosquitoes. In addition, pregnant women can wear long sleeves and long pants when going out, which can reduce the chance of being bitten by mosquitoes.