An assessment of hair cortisol among postpartum Brazilian mothers and infants from a high-risk community in São Paulo: Intra-individual stability and association in mother–infant dyads

摘要: This study examined maternal-infant synchrony of hair cortisol at 12 months after birth and the intra-individual stability maternal in postpartum period. Participants were selected from an ongoing Sao Paulo cohort project, where families are considered to be "high-risk" due their chronic stress experiences, with majority living slums (favelas). Cortisol was collected through 3-cm segments samples, values representing approximate levels 9 for mothers children 6 mothers. Maternal infant reflecting 9-12 highly correlated (r = .61, p < .001); earlier (6-9 months) child (r = .51, p < .001) also correlated. showed over time (r = .79, p < .001). These correlations high compared existing literature on other mother-child dyads, suggesting stronger under high-risk contexts faced challenging circumstances.