This study examines the construct validity of the First-Year Inventory 2.0 with respect to other established instruments in a sample of high-risk infant siblings of children with Autism Spectrum Disorder. The First-Year Inventory 2.0 is a parent-report screening instrument designed to identify 12-month-old infants at risk for an eventual diagnosis…

Fragmented sleep is common in infancy. Although night awakening is known to decrease with age, in some infants night awakening is more persistent and continues into older ages. However, the influence of fragmented sleep on development is poorly known. In the present study, the longitudinal relationship between fragmented sleep and psychomotor…

This study examined whether a novel parent-report questionnaire, the Autism Parent Screen for Infants, could differentiate infants subsequently diagnosed with autism spectrum disorder from a high-risk cohort (siblings of children diagnosed with autism spectrum disorder (n = 66)) from high-risk and low-risk comparison infants (no family history of…

Interaction between mother and first-born child before and after the birth of a second child was studied in 41 families, using home observations and interview techniques. (MP)

This study examined the development of imitation under naturalistic conditions. Participating were 320 parents, who provided diary records of imitation by their 12-, 15-, and 18-month-old infants over a 7-day period. Approximately half of the infants were first-borns and half had older siblings. The findings indicated that infants of all ages…

Individual differences in the social behavior of young siblings were studied in 40 sibling pairs observed at home, when the second child was 8 months old and 14 months old. Differences between same-sex and different-sex sibling pairs were marked by the second observation. More positive social behavior characterized same-sex pairs; more negative…