Early Child Development Stages: Advantage of Prenatal Aural Stimuli

"Remember, though, that the use of the system is optimal beginning when you are halfway through your pregnancy, as your child’s ears would be almost fully developed by then. Effective use of prenatal audio programs is seen to make a difference later during the infant development phase. Hughes says the music helps generate more stimuli in the brain from the baby’s response to gentler sounds. In turn, the increased brain stimulation could lead to better cognitive and motor skills for the baby, and to early-than-normal manifestations of language capabilities."
http://blog.babyplus.com/early-child-development-stages-advantage-prenatal-aural-stimuli/