Place the microphone on the abdominal wall of pregnant women so that the baby can hear the wonderful music more directly. Regarding this currently popular method of musical prenatal education, Professor Niu Fengqi from the Institute of Acoustics of the Chinese Academy of Sciences believes that from the perspective of protecting fetal hearing development, it is best not to use a microphone, which is sufficient for pregnant women to listen to music. Medical acoustics expert Niu Fengqi teaches