This work had as main aim to assess the hearing behavior of 3 to 4 year old children through Measurements of Acoustic Immitance and constitute a objective technique of hearing evaluation. Such measurements are useful in the hearing screening evaluation aiming to detect alterations of the middle ear function that could impair the children language development. One performed an otologic examination and Measurements of Acoustic Immitance on 30 children, being 13 female sex (43,3%) and 17 (56,7%) from male sex. During the otologic examination one verified that 27 children (90%) presented normal otoscopy and 3 (10%) children presented an abnormal one. In the tympanometries shapes one confirmed that 21 right ears (70%) and 19 left ears (63,3%) presented type A shapes; 4 (13,3%) right ears and 6 (20%) left ears type B shapes and 5 (16,7%) right and left ears type C shapes. The estatic compliance values changed from 0,0 ml to 1,8 ml, once the mean values of estatic compliance varied from o,40 to 0,63 ml. The acoustic reflexes were present in normal levels of hearing in most of the children, significant statistic differences were not found relating to age variables. Through this study one verified that the Measurements of Acoustic Immitance are very useful and efficient on the children hearing screening evaluation, allowing to identify short hearing abnormalities and to realize the necessary guidance and directions.