Infants with family history (FH) of autism or attention-deficit/hyperactivity disorder (ADHD) are likely to experience a range of differences in their early development compared to infants without FH. However, the vast majority of evidence concerning the early development of these infants has come from high-income-country (HIC) contexts and has not considered the role of psychosocial environmental factors. In this study, we investigated developmental and environmental differences in a large…
