1. A noisy place
Pregnant women should stay away from the surrounding noise, try not to be affected by noise, and avoid listening to deafening sounds.
2. Chemical factory
Chemicals are harmful to the growth and development of the fetus, and methylmercury can cause fetal malformation; Organic substances such as carbon dioxide, benzene and gasoline can increase the abortion rate; Vinyl chloride can cause congenital dementia in infants; Frequent exposure to high concentrations of lead vapor and lead dust can easily lead to fetal growth retardation and mental retardation.
3. High temperature places
Excessive ambient temperature will affect the development of fetal body and nervous system.