The purpose of this study was to examine the relationships between individual and overall Estimated Developmental Ages (EDAs) calculated for the Uzgiris and Hunt Scales, as outlined in a clinical manual developed by Dunst, and Bayley mental age scores. Thirty-four infants with handicaps enrolled in early intervention programs served as the subjects. The results indicated that (a) there was a significant difference between overall EDAs and Bayley metal age, with Bayley estimates being on the average some 2.1 months higher; (b) the overall EDA and each of the seven individual EDAs were significantly and positively related to Bayley mental age; (c) when all seven EDAs were used in a multiple regression procedure, schemes for relating to objects (sensorimotor play) emerged as the best single correlate when the effects of the other scales were controlled; and (d) a commonality analysis revealed that schemes for relating to objects also explained the largest percentage of unique variance of Bayley mental scores. Recommendations of a test battery reflecting several approaches to the assessment of infants with handicaps are presented. · One pervasive issue facing professionals in the assessment of infants with known or suspected handicaps is the availability of appropriate assessment instruments or techniques.