This study tested whether maternal sensitivity and child security are related during early childhood and whether such an association is found in different cultural and social contexts. Mother-child dyads (N = 237) from four different countries (Colombia, Mexico, Peru, and the United States) were observed in naturalistic settings when children were between 36 and 72 months of age. Maternal and child behavior during interactions at home and in the playground were described using Q methodology. Findings reveal that across cultures, concurrent maternal sensitivity and more specific behavioral domains of maternal care (e.g., contributions to harmonious interactions and secure base support) are important for children's attachment security during early childhood. Implications for the study of attachment relationships beyond infancy and in diverse contexts are highlighted.

Background Mothers have been shown to have higher morning cortisol on days they go to work compared to non-workdays; however, it is unknown how maternal workday associates with child morning cortisol or the attunement of mother-child morning cortisol. Aims This study examined the presence and stability of morning cortisol levels and slopes (i.e., cortisol awakening response or CAR) in a sample of 2 – 4 year old children in out-of-home child care with working mothers. In addition, we examined the differential contributions of maternal workday on mother-child attunement in morning cortisol. Method Mother and child morning cortisol was sampled twice a day (awakening and 30 minutes later) across four consecutive days (2 non-workdays; 2 workdays) among 47 working mothers and their young children. Mothers also reported on compliance with sampling procedures and provided demographic information. Results While children exhibited stability in cortisol levels, children’s CARs were variable, with children’s non-work CARs not predictive of work CARs. Similarly, a significant morning rise in cortisol was only found on workdays, not non-workdays. Overall, mothers had higher cortisol levels and steeper CARs than their children. Further, maternal workday moderated the attunement of mother-child CARs, such that mothers and children had concordant cortisol levels on non-workdays, but discordant cortisol levels on workdays. Conclusions Morning cortisol may be more variable in pre-school aged children than adults but may be similarly responsive to the social environment. Further, workday mornings may be a time of reduced mother-child cortisol attunement.

The evolutionary rationale offered by Bowlby implies that secure base relationships are common in child-caregiver dyads and thus, child secure behavior observable across diverse social contexts and cultures. This study offers a test of the universality hypothesis. Trained observers in nine countries used the Attachment Q-set to describe the organization of children's behavior in naturalistic settings. Children (N = 547) were 10-72 months old. Child development experts (N = 81) from all countries provided definitions of optimal child secure base use. Findings indicate that children from all countries use their mother as a secure base. Children's organization of secure base behavior was modestly related to each other both within and across countries. Experts' descriptions of the optimally attached child were highly similar across cultures.The secure base phenomenon is at the core of Bowlby and Ainsworth's analysis of the infant-mother relationship. Ainsworth coined the term "secure base behavior" based on her naturalistic observations of infant-mother interactions in rural Uganda. When reviewing her field notes, she noticed that infants "do not always stay close to the mothers but rather make little excursions away from her, exploring other objects and interacting with other people, but returning to the mother from time to time" (Ainsworth, 1967, p. 345). The hallmark of secure base behavior is the seemingly purposeful balance between excursions or explorations away from the

The cortisol awakening response (CAR) is a normative rise in cortisol levels across the 30 minutes post awakening. Both the levels and the degree of change in cortisol across this time period are sensitive to the perceived challenges of the day and are thought to prepare the individual to meet these tasks. However, working parents of young children may be under unique strains at this time as they attempt to simultaneously care for their children while also preparing themselves for the workday ahead. In these analyses we examined the contributions of both work and parenting stress on maternal cortisol levels and awakening responses, and how these relationships differed on workdays compared to non-workdays. To do this, saliva samples were collected from 56 working mothers (25% single) with a child between the ages of 2 and 4 years old (mode = 2 children), at awakening and 30-minutes post awakening. Samples were collected on four consecutive days—two non-workdays followed by two workdays. Analyses revealed mothers reporting higher levels of parenting stress had higher average AM cortisol on workdays compared to non-workdays. Further, mothers reporting a combination of high job strain and high parenting stress had significantly higher cortisol levels, and steeper CAR increases on workdays compared to non-workdays. Findings are discussed by integrating knowledge from the fields of parenting stress, work-family, and stress physiology.

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