An otoacoustic emission (OAE) is a low-level sound emitted by the cochlea either spontaneously or evoked by an auditory stimulus. Specifically, OAEs provide information related to the function of the outer hair cells (OHC). Present OAEs in an ear indicates that hearing mechanism is normal till the level of outer hair cells. This cells plays very crucial role in hearing system i.e. amplification of the sound. OAE can be done in 1 day old baby. oae has advantages over BERA test. Easily done, takes almost 3-5 minutes, not much preparing required, many children can be screened in short duration. If child fail on OAE wil be subjected for diagnostic audiological evaluation. and further management will be carried out.