A four-and-a-half-year longitudinal experiment reconsidered the contribution of organic impairment to the genesis of mild mental retardation among disadvantaged children. It was hypothesized that nonoptimal perinatal conditions might result in deficits that increase a child's vulnerability to environmental risk factors. Study results supported the…

The increase in one child families in the 1980's is analogous to the one child family rate during the Depression years. Although family size was limited for economic reasons during the Depression, current increases in the number of one child families are attributed to advances in contraceptive technology, increased employment of women, inhibiting…