In light of the dynamic systems perspective, the current study expanded existing literature by examining the moderating effect of maternal sensitivity on the quadratic association between infant negative reactivity and future executive function development. Using a longitudinal, multimethod design, we addressed executive function development among preschoolers. This study utilized data from the Family Life Project (N = 1292). Infant negative reactivity at 6 months, maternal sensitivity across first 3 years, and executive functions during preschool age were observational assessed. A path model with moderation analyses revealed a U-shaped quadratic association between infant negative reactivity and preschoolers’ inhibitory control, only when maternal sensitivity was high. The results suggest that maternal sensitivity may assist infants with both low and high, but not moderate, levels of negative reactivity towards better executive function development. Findings support the ongoing nonlinear person-environment interplay during early years of life.

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Low‐income, rural families face significant mental health risks. However, the understanding of resources associated with mental health risks is limited. The present study investigated the associations between perceived resources of low‐income, rural mothers, and longitudinal maternal and child outcomes. This study utilized longitudinal data from the Family Life Project (N = 1203), from US rural areas with high poverty rates. Mothers reported their resources at 6‐month postpartum, and their levels of depression, anxiety, and role overload were assessed at 2‐year postpartum. Mothers reported their children's behavioral problems at 3 years old. Using a person‐centered approach, we identified four maternal profiles: lower resources (7.1%); higher intra‐family support (11.1%); higher inter‐family support (20.8%); and higher resources (60.9%). In general, the higher resource profile was associated with lower mental health concerns of mothers and lower levels of behavior problems of children. Mothers in the higher intra‐family support profile had disproportionately higher role overload. Children of mothers in the higher inter‐family support profile showed disproportionately higher behavioral problems. Maternal partner status and education were significant predictors of resource profiles. Findings support the heterogeneity in perceived resources among low‐income, rural families and different risk levels. Identifying these subgroups has significant implications for policy and interventions aimed toward this vulnerable population.