Newborn Hearing Screening is an otoacoustic emission test performed on every newborn between 48 and 72 hours of age during hospitalization, while the newborn is naturally asleep or in a quiet state. Otoacoustic emissions are audio energy generated by external stimulation of the cochlea and released to the external auditory canal through the auditory chain and tympanic membrane, and test the functional status of the outer hair cells of the cochlea. The results of the test are expressed in the form of “pass” and “fail”. A “pass” indicates that the child’s cochlea and outer hair cells have developed normally, while a “fail” indicates that the child’s hearing needs to be rechecked by Baby 42. Otoacoustic emission testing is fast, safe and non-invasive. Newborn hearing screening allows for early screening of children with congenital or neonatal hearing loss, allowing for early diagnosis and intervention to avoid delays.