Soft music is beneficial for pregnant women to secrete some healthy hormones, enzymes, choline acetate and other substances, which can regulate blood flow and excite nerve cells, thus improving the blood supply of placenta and increasing the beneficial components in blood, which is extremely beneficial to the healthy development of fetus. Rock music belongs to excessively intense music. Listening to this kind of music for a long time will strongly stimulate the nervous system of pregnant women, destroy the normal functions of the heart and vascular system, and increase the secretion of norepinephrine in the human body, thus causing the smooth muscle of pregnant women's uterus to contract, causing fetal blood circulation to be blocked, resulting in insufficient blood supply to the placenta, causing placental dysplasia. At the same time, it is also one of the causes of miscarriage or premature delivery.

When listening to light music, the fetal activity is gentle, the heart rate is normal, and when listening to light music after birth, he behaves serenely and even smiles; Those fetuses who often listen to strong disco music in the fetus have a fast heart rate and frequent activities. When they listen to this music again after birth, they will be agitated and their limbs will keep twisting. Even if this music is parked, it will take some time to recover. Therefore, listening to rock music is not good for pregnant women and fetuses.