The primary purpose of this study was to examine uneven early development in premature infants. A multiple regression analysis was performed in which birth weight, length of gestation, length of assisted feeding, and length of ventilation were used to predict the descrepancy between a child's Psychomotor and Mental Scale scores on the Bayley Scales of Infant Development (BSID). The child with a large difference score was expected to have been ventilated longer, to have needed more assistance in feeding, to have had a shorter gestation, and a smaller birth weight than the child with a small difference score. The results of the study did not support the hypothesis that a difficult newborn course would be reflected in a discrepancy between mental age and psychomotor age on the BSID. A post-hoc analysis revealed that none of the four variables were predictive of the size of the discrepancy when directionality was considered. Correlation coefficients between the dependent and independent variables were low. (JAZ)