Forty infants, aged three through 12 months, participated in a study designed to differentiate the auditory response characteristics of normally developing infants in the age ranges three to five months, six to eight months, and nine to 12 months. Their selection was based on a determination of normal development upon pediatric examination and from the results of the Denver Developmental Screening Test. The results confirmed that a predictable developmental pattern as a function of age in the first year of life is observable despite the wide variability that may occur in a given child. Increased knowledge of these developmental milestones in normal-hearing infants should add to more effective programs of early identification and management of hearing-impaired children.