Objectives and hypotheses
Our objective was to investigate the effect of prenatal and postnatal SQ-LNS on social–emotional problems and self-regulation at age 9–11 y and in the context of children’s home environments. Our first hypothesis was that, compared with children who were not exposed to SQ-LNS in early life, those exposed to SQ-LNS would experience fewer social–emotional problems and better self-regulation. Our second hypothesis was that children in less-enriched home environments during early childhood would experience more social–emotional problems and worse self-regulation. Our third hypothesis was that greater effects of SQ-LNS would be found among children from less-enriched home environments.