Each year, the Interagency Autism Coordinating Committee (IACC) releases a list of scientific advances that represent significant progress in the field. The "2019 IACC Summary of Advances" provides short, plain language summaries of the top research breakthroughs selected by the IACC from a pool of research articles nominated by the…

A brief review of the psychological literature on the characteristics of only children is presented in order to determine if the one-child family should be avoided or advocated. The relevant literature is found to be limited in quantity and conceptualization of the only child. Previous literature is divided into three types of study: those with…

This paper discusses the nature of the infant social world. Infants develop attachments to both parents. Father-child and mother-child relationships are qualitatively different. They involve different types of experiences and have different implications for the child's personality development. The fathers' sex-differentiating behavior focuses the…

This study explores and evaluates the explanations for apparent exception to the family size rule that IQ and family size are inversely related. Three large-scale studies were consistent in placing only children lower than firstborns from two-, three-, and four-child families, and at about the same level as firstborns from a five-child family. The…