Mosquito liquid is harmful to pregnant women. Mosquito liquid is mainly composed of pyrethroids, ether, benzene, chloroform and other ingredients, mosquito liquid will produce harmful carcinogenic substances after burning, which have potential adverse effects on the placenta. Especially in early pregnancy, belonging to the critical period of the development of the placenta, cell division, proliferation, differentiation into tissues and organs, can not be exposed to harmful substances, it is not recommended that pregnant women use mosquito liquid. Occasional use of mosquito liquid is not a big relationship, if long-term use of mosquito liquid, may affect the growth and development of the fetus, will adversely affect the nervous system of the fetus, will lead to fetal brain or intellectual development disorders, and serious will cause miscarriage. Pregnant women should try not to use special substances or eat special food, and need to pay attention to the safety of food and substances in their lives, and if any discomfort occurs, they need to go to the hospital in time.