Biological and social cascades of prenatal contextual risk and maternal psychological distress to early-childhood adjustment.

In the peripartum, putative mechanisms in the transmission of prenatal contextual risk and maternal psychological distress include biological and social processes. In this study, path analyses were used to test unique, cascading pathways of prenatal contextual risk and pre- and postnatal maternal psychological distress through social mediators (parenting) and biological mediators (infant stress physiology) on infant temperament and toddler adjustment. The sample is comprised of racially and ethnically diverse first-time mothers (N = 200) living in low-income contexts (< 200% poverty) who were followed from pregnancy to 18-36 months postpartum. In pregnancy, mothers reported contextual risk and psychological distress (anxiety, depression). In the postpartum, mothers reported their psychological distress. At 2-4 months postpartum, observed mother-infant interactions were coded for sensitive responsiveness. Infant cortisol baseline and reactivity to a lab stressor were collected when infants were 4-6 months old. Mothers reported on infant's temperament (negative affect, effortful control) at 10-12 months and on child adjustment (internalizing, externalizing symptoms) at 18-36 months. Prenatal contextual risk predicted infant cortisol reactivity. Prenatal psychological distress predicted postnatal distress but, when accounting for postnatal distress, did not predict putative mediators or indicators of child adjustment. In contrast, maternal postnatal depression predicted subsequent maternal sensitive responsiveness, which in turn predicted later infant baseline cortisol and cortisol reactivity. Baseline cortisol predicted infant negative affectivity, which predicted toddler internalizing and externalizing symptoms. There was no evidence of mediated effects of prenatal variables on child adjustment outcomes, whereas contextual risk, postnatal psychological distress, and parenting were more salient predictors of child adjustment. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Preliminary Evaluation of the Effectiveness of Perinatal Mindfulness-Based Well-Being and Parenting Programs for Low-Income New Mothers.

Objectives: This study examined specificity in the effects of three perinatal mindfulness-based prevention programs that differed in their timing (prenatal, postpartum) and target (maternal well-being, parenting). Effects on maternal mental health (depression, anxiety, resilience), mindfulness, and observed parenting, as well as observed, physiological, and mother-report indicators of infant self-regulation, were examined. Methods: The programs were evaluated in a racially and ethnically diverse sample of first-time mothers (n = 188) living in low-income contexts using intention-to-treat analysis. Mothers were assigned to a prenatal well-being, postpartum well-being, parenting, or book control group. Multi-method assessments that included questionnaire, observational, and physiological measures were conducted at four time points: during pregnancy (T1) and when infants were 2-4 months (T2), 4-6 months (T3), and 10-12 months. Results: Compared to the postpartum intervention and control groups, the 6-week prenatal well-being intervention was related to decreases in depressive symptoms during pregnancy but not postpartum, higher maternal baseline respiratory sinus arrhythmia (RSA), fewer intrusive control behaviors, and lower infant cortisol levels in the early postpartum period. Compared to all other groups, the postpartum parenting intervention was related to decreases in maternal anxiety and increases in responsive parenting. Some differential effects across programs might be due to differences in attendance rates in the prenatal (62%) vs. postpartum (35%) groups. Conclusions: The findings suggest that brief mindfulness-based well-being and parenting preventive interventions can promote maternal and infant mental health in families living in low-income, high-stress settings, particularly if accessibility can be enhanced. Preregistration: This study is not preregistered.

Quantifying cortical development in typically developing toddlers and young children, 1-6 years of age.

Cortical maturation, including age-related changes in thickness, volume, surface area, and folding (gyrification), play a central role in developing brain function and plasticity. Further, abnormal cortical maturation is a suspected substrate in various behavioral, intellectual, and psychiatric disorders. However, in order to characterize the altered development associated with these disorders, appreciation of the normative patterns of cortical development in neurotypical children between 1 and 6 years of age, a period of peak brain development during which many behavioral and developmental disorders emerge, is necessary. To this end, we examined measures of cortical thickness, surface area, mean curvature, and gray matter volume across 34 bilateral regions in a cohort of 140 healthy children devoid of major risk factors for abnormal development. From these data, we observed linear, logarithmic, and quadratic patterns of change with age depending on brain region. Cortical thinning, ranging from 10% to 20%, was observed throughout most of the brain, with the exception of posterior brain structures, which showed initial cortical thinning from 1 to 5 years, followed by thickening. Cortical surface area expansion ranged from 20% to 108%, and cortical curvature varied by 1-20% across the investigated age range. Right-left hemisphere asymmetry was observed across development for each of the 4 cortical measures. Our results present new insight into the normative patterns of cortical development across an important but under studied developmental window, and provide a valuable reference to which trajectories observed in neurodevelopmental disorders may be compared.