Timing matters: Maternal stress and mental health symptoms from pregnancy to postpartum in shaping infant development.
Psychoneuroendocrinology · 2026 · PMID 42966221
Les originalt sammendrag (engelsk)
Maternal perceived stress, mental health, and physiological dysregulation during pregnancy can alter the intrauterine environment, shaping infant development through fetal programming processes. Nonetheless, few longitudinal studies in low- and middle-income countries (LMICs) have jointly examined psychological and biological factors in relation to infant outcomes. This longitudinal study followed 146 Pakistani mother-infant dyads at early to mid-gestation (T1), mid- to late gestation (T2), and postpartum (T3). Maternal perceived stress, depressive symptoms, and social support were measured across all timepoints, whereas pregnancy-related anxiety and an allostatic load index of physiological dysregulation were measured during pregnancy. Infant developmental outcomes across five domains were assessed using the Ages and Stages Questionnaire (ASQ-3). Perceived stress at each timepoint, depressive symptoms at T1 and T3, and allostatic load at T1 were associated with poorer infant fine motor skills. Perceived stress at T3 was linked to poorer infant problem solving. Communication, gross motor, and personal-social skills in infants showed no associations. Higher T3 social support attenuated the relationship between prenatal perceived stress and fine motor skills. Moreover, an exploratory interaction showed that T1 allostatic load related to lower fine motor skills when T3 stress is high. Psychological and biological pathways may link maternal prenatal risk to infant fine motor development, with the postpartum environment possibly influencing whether prenatal vulnerabilities translate into delays. Interventions strengthening social resources and reducing postpartum stress may help disrupt intergenerational stress transmission in LMICs.