After the fourth month of pregnancy large decibel noise may affect the fetal hearing, general noise will not have an effect on the fetal hearing, after the fourth month of pregnancy as far as possible do not stay in the noise strong place. After four months of pregnancy fetal hearing gradually formed, the fetus can hear the mother’s heart beat, blood flow, gastrointestinal peristalsis sound, after six months of pregnancy fetal hearing is almost equal to adults, after seven months of pregnancy to large decibel noise stimulation has the ability to respond. After the fourth month of pregnancy try not to stay in the noise for a long time in the place too strong, long stay in the strong noise environment, the mother’s abdominal wall protection ability is limited, for the low-frequency sound has no attenuation function, equivalent to the fetal auditory system directly with the strong noise contact, the general noise on the hearing of the fetus will not have any effect. Long-term exposure of pregnant women to high-intensity noise stimulation will affect the development of the fetal brain and may have adverse consequences on the development of fetal hearing. Prolonged exposure to noise disrupts the functioning of endocrine glands in pregnant women, causing strong contractions of the uterus and increasing the chances of miscarriage and preterm labor. After pregnancy, try to stay in a quiet and comfortable place to live, and usually do a good maternity checkup during pregnancy.