Pregnant women accidentally sniffing pesticides has no effect, pregnant women just accidentally sniffing pesticides once in a while will not bring about any effect on the health of pregnant women and the development of the fetus. If a pregnant woman smells pesticides for a long time, resulting in more inhalation of pesticides in the body, it is easy for abnormal fetal development to occur. Especially in the first trimester of pregnancy, it may lead to fetal developmental abnormalities, such as the presence of harelip and other aspects of deformity changes, but also may lead to heart or kidney dysplasia and so on. The middle and late stages of pregnancy may affect the development of the fetus’s nervous system, leading to poor brain development, mental retardation, and so on. After pregnancy, it is important to avoid exposure to toxic and harmful substances, avoid moving into a newly renovated room, take rest, keep a happy mood, avoid anxiety and excessive stress, etc., in order to ensure that the health of the pregnant woman as well as the growth and development of the fetus will not be affected. Pregnant women need to follow the doctor’s instructions to visit the hospital regularly for examination and timely detection of abnormalities.