The developmental outcome of 2- and 4-year-old children who had been exposed as infants to chloride-deficient formula was studied. A negative dose-response relationship was demonstrated between use of the formula without additional nutritional supplementation and cognitive outcome as measured by the Bayley Scales of Infant Development (Pearson r = –.55, P = .01) at 2 years of age. A similar negative relationship was demonstrated between this exclusive use of the defective formula and perceptual (Pearson r = –.51, P < .05), motor (Pearson r = –.52, P < .05), and fine motor (Pearson r = –.75, P < .002) ability as measured by the McCarthy Scales of Children's Abilities at 4 years of age. When other known predictors of developmental outcome were taken into account by means of multiple linear regression analyses, exclusive formula use emerged as an important predictor of the children's cognitive functioning at 2 years (model R2 = .59, P < .005) and of quantitative (model R2 = .58, P < .006), perceptual (model R2 = .63, P < .009), and fine motor ability (model R2 = .74, P < .003) at 4 years of age. These data raise concern about the developmental outcome of the children exposed to chloride-deficient formula.
Low-income mother-infant pairs were randomly assigned to rooming-in (N = 143) or to routine (N = 158) postpartum contact to determine whether rooming-in affects subsequent adequacy in parenting. At mean age 17 months, two rooming-in and ten control children had experienced inadequate parenting. One rooming-in and eight control children were hospitalized for these problems. One rooming-in and five control families were reported to Protective Services for mistreatment of the study child; five control and no rooming-in children were in the care of adults other than their parents at the time of data analysis. In this study, rooming-in correlated with fewer subsequent cases of parenting inadequacy.