How old is your baby? Is it a fetus? If it is a fetus, the music should be controlled within 60 decibels. It should not be too loud, otherwise it will affect the baby's hearing. This is why today's expectant mothers do not use mobile phones to play music, but choose genius baby music prenatal training machines. The reason for the music prenatal training machine is that it has an automatic sound control system. Once the sound exceeds the set safe range, it will automatically reduce the sound to a safe range.