The Effects of Infant Child Care on Infant-Mother Attachment Security: Results of the NICHD Study of Early Child Care NICHD Early Child Care Research Network

The aims of this investigation were to determine whether Strange Situation attachment classifications were equally valid for infants with and without extensive child-care experience in the first year of life and whether early Child Care experience, alone or in combination with mother/child factors, was associated with attachment security, and specifically with insecure-avoidant attachment. Participants were 1,153 infants and their mothers at the 10 sites of the NICHD Study of Early Child Care. Mother were interviewed, given questionnairies, and observed in play and in the home when their infants were from 1 to 15 months of age; infants were observed in child care at 6 and 15 months and in the Strange Situation at 15 months. Infants with extensive Child Care experience did not differ from infants without child-care in the distress they exhibited during separations from mother in the Strange situation or in the confidence with which trained coders assigned them attachment classifications. There were no significant main effects of Child Care experience (quality, amount, age of entry, stability, or type of care) on attachment security or avoidance. There were, however, significant man effects of maternal sensitivity and responsiveness. Significant interaction effects revealed that infants were less likely to be secure when low maternal sensitivity/responsiveness was combined with poor quality child care, more than minimal amounts of child care, or more than one care arrangement. In addition, boys experiencing many hours in care and girls in minimal amounts of care were somewhat less likely to be securely attachment.     

“The ‘Effects’ of infant day care reconsidered” reconsidered: Risks for parents,children, and researchers

In his article “The ‘Effects’ of Infant Day Care Reconsidered”, Belsky (1988) concludes that maternal employment puts infants at risk for developing emotional insecurity and social maladjustment. After a review of Belsky's and other research, this article offers a different conclusion. It is agreed that infants whose mothers work full-time during their first year are consistently and statistically significantly more likely than infants of mothers who work part-time or not at all to be classifed as insecurely attached when such infants are observed with their mothers in the Strange Situation. However, the difference is not large (8% greater probability), and it does not necessarily reflect emotional maladjustment. It is based on a single assessment procedure with a single partner, a procedure in which day-care infants may feel more comfortable than do other infants. Observations of heightened aggression in children who have been in day care as infants offer limited evidence of maladjustment as a consequence of maternal employment. But, there is no clear evidence that day care places infants at risk. Belsky suggests that observed day-care effects on attachment and aggression may be moderated by day-care quality; children's age, sex, and temperament; hours of separation from mother; overstimulation by mother; and congruence between the mother's attitude and work status. However, there is no convincing evidence that these factors are involved. The most promising factors to be used in accounting for individual differences in daycare infants' emotional development are the mother's attitude toward the infant, her emotional accessibility and behavioral sensitivity, and her desire for independence (her own and the infant's). What is needed now is research to assess and investigate such mediating factors, rather than blanket generalizations about day-care effects and implicit or explicit condemnations of maternal employment.     

Temperament, emotion, and social interactive behavior in the strange situation: a component process analysis of attachment system functioning

This study examines the contributions of temperamentally and nontemperamentally based emotional reactions to the organization of social interactive behavior within the Strange Situation to better understand the emotional underpinnings of attachment system functioning. At 12 1/2 and 19 1/2 months, temperamental fear (assessed via maternal report) was related to independent per-episode dimensions of social interactive and distress behavior. Fear was moderately correlated with both distress and interactive dimensions at each age. Path-analytic models revealed that temperamental fear had direct effects on interactive behavior and also indirect effects mediated by preceding distress reactions. However, residualized measures of "context-specific" distress (with temperamental variance removed) were still highly consistent across Strange Situation episodes and also significantly predicted subsequent social interactive behavior; furthermore, stable distress reactions from 12 1/2 to 19 1/2 months significantly predicted concurrent stability in social interactive behavior. We discuss likely sources of "context-specific" emotional influences on Strange Situation behavior and also age-related differences in these findings.     

Attachment classification from the perspective of infant-caregiver relationships and infant temperament

Recently a number of investigators have suggested that classification differences in the Ainsworth Strange Situation (anxious and secure patterns of attachment) may be due largely or in part to endogenous temperamental variation. In doing so, these investigators have suggested a dimensional-trait approach in place of a qualitatively different taxonomic approach. Moreover, much evidence is directly contrary to a strong temperament interpretation of attachment patterns (changing attachments, differing attachments with different caregivers, prospective data on the early characteristics of infants later classified as securely or anxiously attached). Other interactionist temperament models currently have not been tested sufficiently. At the same time, a host of research findings support the interpretation that Ainsworth assessments capture aspects of the relationship between infant and caregiver, as derived from the history of their interaction. This includes direct evidence from observations of infants and mothers over time, the influence of varying patterns of care within and between cultures, the impact of factors presumed to influence quality of care (e.g., social support, life stress, caregiver family history), and predictions of later parent behavior from strange situation assessments of infant behavior. The importance of understanding attachment as a relational concept is twofold: it represents a theoretical and paradigmatic shift of importance for many aspects of developmental psychology, and it opens the way for more productive research on temperament, the interaction between temperament and experience, and important process studies of the unfolding of the infant-caregiver relationship.     

Attachment from infancy to early adulthood in a high-risk sample: continuity, discontinuity, and their correlates

This study explores the stability of attachment security and representations from infancy to early adulthood in a sample chosen originally for poverty and high risk for poor developmental outcomes. Participants for this study were 57 young adults who are part of an ongoing prospective study of development and adaptation in a high-risk sample. Attachment was assessed during infancy by using the Ainsworth Strange Situation (Ainsworth & Wittig) and at age 19 by using the Berkeley Adult Attachment Interview (George, Kaplan, & Main). Possible correlates of continuity and discontinuity in attachment were drawn from assessments of the participants and their mothers over the course of the study. Results provided no evidence for significant continuity between infant and adult attachment in this sample, with many participants transitioning to insecurity. The evidence, however, indicated that there might be lawful discontinuity. Analyses of correlates of continuity and discontinuity in attachment classification from infancy to adulthood indicated that the continuous and discontinuous groups were differentiated on the basis of child maltreatment, maternal depression, and family functioning in early adolescence. These results provide evidence that although attachment has been found to be stable over time in other samples, attachment representations are vulnerable to difficult and chaotic life experiences.     

III. ATTACHMENT AND EMOTIONAL DEVELOPMENT IN INSTITUTIONAL CARE: CHARACTERISTICS AND CATCH UP

Attachment has been assessed in the extreme environment of orphanages, but an important issue to be addressed in this chapter is whether in addition to standard assessment procedures, such as the Strange Situation, the lack of a specific attachment in some institutionalized children should be taken into account given the limits to the development of stable relationships in institutionalized care. In addition, this chapter discusses disinhibited or indiscriminately friendly behavior that is often seen in institutionalized children. Enhanced caregiving quality alone appears to be insufficient to diminish indiscriminate behavior, at least in some children, as evidenced by the persistence of indiscriminate behavior in children adopted out of institutions into adoptive families. We suggest that the etiology and function of indiscriminate, “friendly” behavior may be different for institutionalized versus not‐institutionalized children. In the first case it may reflect a distortion or disruption of early attachment relationships; in the latter case it is likely to result from the lack of expected input in the form of contingent interactions with a stable caregiver in early life. We try to delineate infant and caregiver characteristics that are associated with secure attachment in institutional settings, given the inevitable fact that large numbers of infants worldwide are being raised, and will be raised, in contexts of institutional care. We conclude that much further study is needed of the development of children's attachments following adoption out of an institutional setting.     

Attachment security in infancy and early adulthood: a twenty-year longitudinal study

Sixty White middle-class infants were seen in the Ainsworth Strange Situation at 12 months of age; 50 of these participants (21 males, 29 females) were recontacted 20 years later and interviewed by using the Berkeley Adult Attachment Interview (AAI). The interviewers were blind to the participants' Strange Situation classifications. Overall, 72% of the infants received the same secure versus insecure attachment classification in early adulthood, K = .44, p < .001. As predicted by attachment theory, negative life events-defined as (1) loss of a parent, (2) parental divorce, (3) life-threatening illness of parent or child (e.g., diabetes, cancer, heart attack), (4) parental psychiatric disorder, and (5) physical or sexual abuse by a family member-were an important factor in change. Forty-four percent (8 of 18) of the infants whose mothers reported negative life events changed attachment classifications from infancy to early adulthood. Only 22% (7 of 32) of the infants whose mothers reported no such events changed classification, p < .05. These results support Bowlby's hypothesis that individual differences in attachment security can be stable across significant portions of the lifespan and yet remain open to revision in light of experience. The task now is to use a variety of research designs, measurement strategies, and study intervals to clarify the mechanisms underlying stability and change.     

Attachment to Mother/Attachment to Father: A Meta-Analysis

An important tenet of attachment theory is that classification of security or insecurity as derived from the Strange Situation reflects the quality of an infant's relationship with its caregiver. One piece of evidence supporting this claim is the lack of concordance of classification between an infant and its mother and father. We performed a meta-analysis of the 11 studies that have examined the concordance of mother/father attachment to an infant. We found that security of attachment to one parent was dependent upon security to the other parent, that type of insecurity (avoidant/resistant) to one parent was dependent upon type of insecurity to the other, and that subcategory classification within the secure category (B1B2/B3B4) to one parent was dependent upon subcategory classification to the other. These data raise important questions regarding the meaning of infant attachment classification as derived from the Strange Situation. Among the possible explanations for the pattern of data are existence of concordant parenting styles and/or influence of infant temperament (possibly the tendency to cry upon separation) on classification of security/insecurity in the Strange Situation.     

Quality of Toddler-Mother Attachment in Children with Down Syndrome: Limits to Interpretation of Strange Situation Behavior

Researchers studying social-emotional development have argued that primary attachment relationships, established by the end of the first year of life, are important organizing factors that influence the trajectory of development throughout childhood. Central to this argument is a dimension of "attachment security," along which attachments differ. For normally developing infants and toddlers, attachment security is assessed using the Ainsworth Strange Situation. However, it is not clear that this procedure is appropriate for evaluating attachment security in atypical populations. In this report, 3 samples of children with Down Syndrome (total N = 138) were assessed using the Strange Situation. The procedures were scored according to traditional protocols. Although the 3 samples differed with respect to chronological and developmental age, they showed basic similarity with respect to attachment variables. However, developmentally younger children were more difficult to classify using the standard scoring rules. Scores and classifications for the sample were compared to scores from a sample of normally developing children tested at about 12 months of age. Significant differences with respect to the distributions of cases to classification categories and with respect to the interactive scale scores suggest that the Strange Situation may be measuring different aspects of behavior for children with Down Syndrome, even when they are tested at similar developmental age levels.     

Effects of maternal absence due to employment on the quality of infant-mother attachment in a low-risk sample

Recent reports have suggested that day-care experience initiated prior to 12 months of age is associated with increased proportions of infants whose attachment to mother is classified as "insecure-avoidant." However, reviewers have questioned the generality of these findings, noting that samples in which associations between early day-care experience and avoidant attachment patterns have been reported come from high-risk populations, and/or that the infants' day-care settings may not have been of high quality. In the present study, effects of maternal absences on infant-mother attachment quality were assessed in a low-risk, middle-class sample (N = 110). In all instances, substitute care had been initiated at least 4 months prior to the infant's first birthday and was provided in the infant's home by a person unrelated to the baby. Infants were assessed using the Ainsworth Strange Situation when they were 12-13 months of age. Analyses indicated that a significantly greater proportion of infants whose mothers worked outside the home (N = 54) were assigned to the category "insecure-avoidant" as compared to infants whose mothers remained in the home (N = 56) throughout the first year of life. Analyses of demographic and psychological data available for the sample indicated that this relation is dependent upon maternal parity (primi- vs. multiparous mother). The association between attachment quality and work status was significant only for firstborn children of full-time working mothers. The results are interpreted as evidence that the repeated daily separations experienced by infants whose mothers are working full-time constitute a "risk" factor for the development of "insecure-avoidant" infant-mother attachments.     

Teacher-student attachment relationship,variables associated,and measurement: A systematic review

This systematic review offers an overview of the results of research from the last 10 years concerning the teacher-student relationship and its connection with other attachment theory constructs and child development variables. An exhaustive search of Web of Science, SCOPUS, and PsycINFO was performed, finding a total of 24 studies that met the established eligibility criteria. The evidence accumulated between 2010 and 2020 suggests that: 1) early care experiences have an effect on the formation of new relationships at primary school, although it is possible that children will construct new mental representations based on interactions in day to day life, 2) at the level of the teacher's characteristics, attachment style and the availability towards children's needs seem to be associated with school adjustment and problematic behaviour in children, and 3) the quality of the teacher-student relationship is significantly associated with externalizing and internalizing behaviour, school liking, peer acceptance, academic performance, self-concept and emotional regulation in children. For its part, when evaluating the quality of the teacher-student relationship, STRS continues to be widely used to study the teacher's perspective. However, in recent years other measurement instruments have become available that explore the perspective of the student, most notably CARTS and SPARTS. Advances in the study of the teacher-student relationship as a bond with important implications for the development of children in the primary education stage are discussed.     

Attachment and child care: Relationships with mother and caregiver

Two studies examined the influences of concordant and nonconcordant attachment relationships to mothers and to child care caregivers on children's behavior in child care. In both studies, attachment security with the caregiver was assessed within child care, using the Waters and Deane Q-sort for attachment security. In the first study, 40 infants were seen in the Strange Situation at 12 months and observed in child care when they averaged 21.5 months. In the second study, 60 infants were observed in child care when they averaged 18.5 months; maternal attachment security was assessed, using the Q-sort, during child care arrivals and departures. In both studies, the child's level of competence in play with the adult caregiver and engagement with peers was a function of attachment security with both mother and caregiver.     

The Effect of Hearing Impairment on the Quality of Attachment and Mother-Toddler Interaction

In the present study, 41 hearing impaired and 41 hearing toddlers together with their hearing mothers were observed in Ainsworth's Strange Situation and during free play. Both security of attachment and ratings of maternal and toddler behavior during free play were remarkably similar for the hearing impaired and hearing dyads. In addition, security of attachment was related to the ratings of maternal and toddler behavior in a similar way for the hearing impaired and hearing toddlers. The results suggest that development of a secure attachment and maintaining a good mother-toddler relationship does not depend on normal language development during the toddler years.     

Expressions of the Attachment Relationship Outside of the Strange Situation

41 preterm infants and 38 full-term infants and their mothers were observed at home at 8 and 12 months of age and in the Strange Situation at 18 months in order to compare expressions of attachment relationships in these 2 settings. There was 84% concordance in the distinctions between secure and nonsecure classifications of the mother-infant relationship made at home at 12 months and in the Strange Situation. Classifications of avoidant relationships also displayed high concordance, but only 6 of the 15 dyads classified at home as ambivalent were classified in the same way in the Strange Situation. Mothers in secure relationships as assessed in the Strange Situation were rated as more sensitive at both 8 and 12 months than mothers in either avoidant or ambivalent relationships, whereas the sensitivity of mothers in these two nonsecure relationships did not differ significantly. Infants in secure relationships in the Strange Situation were characterized by more effective secure base behavior and more affective sharing and enjoyment of physical contact, and they were less fussy or difficult during the 12-month home observations.     

Nonmaternal care in the first year of life and the security of infant-parent attachment

Evidence from 2 longitudinal studies of infant and family development was combined and examined in order to determine if experience of extensive nonmaternal care in the first year is associated with heightened risk of insecure infant-mother attachment and, in the case of sons, insecure infant-father attachment. Analysis of data obtained during Strange Situation assessments conducted when infants were 12 and 13 months of age revealed that infants exposed to 20 or more hours of care per week displayed more avoidance of mother on reunion and were more likely to be classified as insecurely attached to her than infants with less than 20 hours of care per week. Sons whose mothers were employed on a full-time basis (greater than 35 hours per week) were more likely to be classified as insecure in their attachments to their fathers than all other boys, and, as a result, sons with 20 or more hours of nonmaternal care per week were more likely to be insecurely attached to both parents and less likely to be securely attached to both parents than other boys. A secondary analysis of infants with extensive care experience who did and did not develop insecure attachment relationships with their mothers highlights several conditions under which the risk of insecurity is elevated or reduced. Both sets of findings are considered in terms of other research and the context in which infant day-care is currently experienced in the United States.     

Child care in the preschool years: Attachment,behaviour problems and cognitive development

The possible implications of the experience of non parental care on cognitive development and on behaviour problems are considered in interaction with individual and contextual variables. A sample of 47 Swiss children who experienced varying kinds of care arrangements were studied longitudinally between 1 and 5 years of age. The effects of the experience of care were related to mothers’ reports of behavioral problems (CBCL, with subscales of internalizing and of externalizing problems) at age 5, and to cognitive developmental quotients (at 1, 2 and 5 years). Several variables were considered for their potential interaction with the experience of care, such as the pattern of attachment to the mother (observed at 21 months of age in the “Strange Situation”), characteristics of the experience of care (duration and type of care), its quality (relationship with non parental caregivers), the socio-economic status of the family, etc. The effect of non parental care on behaviour problems (5 years) happened to be mediated by the the pattern of attachment to the mother: insecurely attached children had some risk to be reported as having externalizing problems, but this didn’t occur when they had an extended experience of non parental care, and when non parental care was mainly family-based. The effect of non parental care on cognitive development was mediated by the quality of care: children with a positive contact with the caregivers had greater cognitive gains between 2 and 5 years; the relationship with the care-givers itself was influenced by the quality of the relationship with the mother. The limited size and origin of the sample restricts generalization, however these data might contribute to the notion that non parental care can have varying effects depending of the type of care, the quality of the relation with the caregivers, the age and personal traits of the child.     

Early Attachment Organization With Both Parents and Future Behavior Problems: From Infancy to Middle Childhood

Links between children's attachment security with mothers and fathers, assessed in Strange Situation with each parent at 15 months (N = 101), and their future behavior problems were examined. Mothers and fathers rated children's behavior problems, and children reported their own behavior problems at age 8 (N = 86). Teachers rated behavior problems at age 6½ (N = 86). Insecurity with both parents had a robust effect: “Double‐insecure” children reported more overall problems, and were rated by teachers as having more externalizing problems than those secure with at least 1 parent. Security with either parent could offset such risks, and security with both conferred no additional benefits. High resistance toward both parents in Strange Situation may confer “dual risk” for future externalizing behavior.     

Attachment behavior, attachment security, and temperament during infancy

In summary reviews and empirical research, investigators have suggested that attachment classifications derived from the Ainsworth Strange Situation may reflect variations along dimensions of temperament as well as, or perhaps instead of, individual differences with respect to infant-mother attachments. In this study, relations between temperament dimensions from the Infant Temperament Questionnaire (Revised) and Strange Situation behaviors were evaluated. Relations between the behavioral style scores and the categories of attachment quality were also tested. The hypothesis that temperamental difficulty would be related to negative emotionality, as indexed by infant distress during separation (but not during the reunions), was tested and supported. Neither the behavioral style dimensions nor the temperamental diagnoses (e.g., "easy" vs. "difficult") were associated significantly with attachment classifications. The results are consistent with previous findings that temperament measures do not predict attachment security. Nevertheless, certain behaviors indexing negative emotionality that may be observed in the context of the Strange Situation are related to temperamental variability.     

The legacy of early attachments

The impact of early close relationships on psychological development is one of the enduring questions of developmental psychology that is addressed by attachment theory and research. This essay evaluates what has been learned, and offers ideas for future research, by examining the origins of continuity and change in the security of attachment early in life, and its prediction of later behavior. The discussion evaluates research on the impact of changing family circumstances and quality of care on changes in attachment security, and offers new hypotheses for future study. Considering the representations (or internal working models) associated with attachment security as developing representations, the discussion proposes that (1) attachment security may be developmentally most influential when the working models with which it is associated have sufficiently matured to influence other emerging features of psychosocial functioning; (2) changes in attachment security are more likely during periods of representational advance; and (3) parent-child discourse and other relational influences shape these developing representations after infancy. Finally, other features of early parent-child relationships that develop concurrently with attachment security, including negotiating conflict and establishing cooperation, also must be considered in understanding the legacy of early attachments.     

Social-emotional adaptation and infant-mother attachment in siblings: role of the mother in cross-sibling consistency

We investigated concordance in social-emotional behavior and attachment of first- and secondborn siblings from 65 families. Both children were seen at 24 months in a problem-solving procedure and at 12 months in the Strange Situation. Maternal behavior at 24 months also was examined. Child behaviors at 24 months showed trends toward concordance across siblings. Maternal behavior was significantly stable across siblings and correlated significantly with child competence. In post-hoc analyses, the sample was split into 2 groups: maternal behavior stable (N = 36) and maternal behavior unstable. In the first group, cross-sibling correlations were significant and larger than for the whole sample; in the second group, cross-sibling correlations were low and nonsignificant. There also was significant concordance across siblings in attachment classification. These data suggest that it is essential to consider the care received by different children in investigating similarities in siblings' behavior.