It is not recommended to use or smell the cool oil during pregnancy, cool oil contains camphor, menthol, ice and eucalyptus oil and other ingredients, may adversely affect the development of the fetus, especially in the first trimester of pregnancy women should pay more attention to, so as not to affect the fetus and the safety of pregnant women, induced preterm labor, the specific hazards are as follows: 1, causing dizziness: if pregnant women for a long time, a large number of doses of cool oil, that is, dizziness, paralysis of the symptoms of severe Endanger the safety of pregnant women and the fetus, so do not use the cool oil; 2, cause preterm labor, abortion: cool oil contains ice components, easy to lead to preterm labor, the risk of abortion, cool oil instructions clearly marked pregnant women are prohibited. Long-term use of cooling oil or use too much cooling oil, can enter the maternal circulation through the placental barrier, which may affect fetal development, easily lead to fetal growth retardation or malformation; 3, harm to the fetus: the first trimester of pregnancy if too much use of cooling oil, camphor will enter the amniotic cavity through the placental barrier to the role of the fetus, can lead to the death of the fetus in serious cases.