The fetus usually starts to hear at 6 months of age and the development of fetal hearing can be divided into many stages. At 8 weeks of pregnancy, the fetus’ nervous system has begun to improve, and the auditory nerve has begun to develop, and by 24 weeks of pregnancy, the fetus’ right and left cochlea have basically developed. Between 15 and 20 weeks of pregnancy, the fetus starts to hear gradually and can respond to external sounds, but it is not sensitive to external sounds. By the time the baby is between 24-28 weeks of pregnancy, it has a clear ability to respond to sound stimuli. When the baby’s hearing has begun to develop, pregnant women should pay attention to protect the baby’s hearing, and try to go to places with noisy sounds, such as dance halls and other places. If you hear fetal music, you should also choose a smaller and softer sound.