This interim report is part of a longitudinal study of developmental behavior designed to determine whether infants from culturally disadvantaged homes have different developmental patterns than infants from advantaged homes. Twenty six culturally disadvantaged infants were individually evaluated on the Bayley Scale of Infant Mental and Motor Development and the Bayley Infant Behavior Profile at 1, 2, 3 and 6 months of age. The mother of the infant and a special evaluator/observer were present as each baby was evaluated. The resulting mental, motor and behavior data indicated average to above average mental and motor quotients and "normal" early behavior patterns. Since older disadvantaged children perform at subnormal levels on standardized tests, it was noted that these data highlight the second and third years of life as crucial to the development of patterns related to intellectual development. (NH)