Pregnant women are advised not to use mosquito repellent sprays, as these sprays usually contain some harmful substances that can easily affect the growth and development of the fetus. The general mosquito repellent liquid or flower water usually has the registration certificate number and approval number of pesticides on the outer bottle, which indicates that this kind of mosquito repellent spray is toxic. Although the effect of mosquito repellent is more obvious, but if used for a long time, it will cause damage to the human body, pregnant women, newborns, as well as some of the skin lesions of the population, it is not recommended to use this approach to mosquito repellent. Elderly people, children are usually weak, poor immunity, but also to be used in moderation, can not rely on this way to repel mosquitoes for a long time. In addition, some mosquito repellent flower water contains volatile components of musk, easy to cause uterine contractions, the use of early in pregnancy there is the possibility of causing miscarriage.