Behaviors emerge, in part, from the interplay of infant abilities and caregiver-infant interactions. Cross-cultural and developmental studies suggest caregiver handling and positioning influence infant development. In this prospective, longitudinal study, the effects of 3 weeks of enhanced handling and positioning experiences provided to 14…

This study examined the increase in salivary cortisol from midmorning to midafternoon in 151 children (3.0-4.5 years) in full-time home-based day care. Compared to cortisol levels at home, increases were noted in the majority of children (63%) at day care, with 40% classified as a stress response. Observations at day care revealed that intrusive,…

This study examined the effects of prenatal cocaine exposure on infant hypothalamic-pituitary-adrenal axis activity and reactivity at 7 months of infant age. Participants were 168 caregiver-infant dyads (87 cocaine exposed, 81 not cocaine exposed; 47% boys). Maternal behavior, caregiving instability, and infant growth and behavior were assessed,…

Compared behavior of 52 Costa Rican 12- to 23-month-olds with iron-deficiency anemia to that of 139 infants with better iron status. Found that iron-deficient infants maintained closer contact with caregivers; showed less pleasure and playfulness; were more wary, hesitant, and easily tired; made fewer attempts at test items; and attended less to…

Examined attachment classification of children with cleft lip and palate (CLP) and isolated cleft palate (ICP) and comparison group at 12 months of age; found no significant differences. Findings suggest that infants with clefts, despite special needs and caregiving requirements, seem not to have elevated risk for insecure attachments at the end…

Examined concordance between foster mothers' attachment state of mind and infants' attachment quality. Found that two-way correspondence between maternal state of mind and infant attachment quality was similar to that of biological mother-infant dyads. Age at placement was not related to attachment quality. Concordance between maternal state of…

Examined development of displaced reference in four deaf children who used homesign and in 18 hearing children. Found that deaf children referred to the nonpresent less frequently and at later ages than hearing children, both groups followed similar developmental paths. Deaf children evoked the nonpresent by generating novel gestures, modifying…

Provides a comparative assessment of maternal and nonmaternal infant caregiving practices in own-home and unregulated family day-care homes, respectively. A total of 30 caregivers (10 employed mothers, 10 substitute caregivers, and 10 nonemployed mothers) were observed in interaction with five- to six-month-old infants. (Author/RH)

Compared the proportions of nouns and verbs in early vocabularies of English- and Mandarin-speaking toddlers and their mothers. Found that Mandarin-speaking children had relatively fewer nouns and more verbs than English-speaking children. When reading books, children's vocabularies were dominated by nouns but not when playing with toys. Mothers…

Compared language development of 16 firstborn and 16 secondborn children at 21 months to investigate whether secondborn children benefit from overheard conversations between caregivers and older siblings. Found that secondborn children were more advanced that firstborn in pronoun production, while not differing general language development,…

Evaluated an intervention designed to influence mothers' sensitive responsiveness toward their infant by presenting information about the newborn's competence to interact and promoting affectionate handling and interaction. Found that the enhancement group showed greater frequency of co-occurrences involving vocal exchanges, looking to the…

Two studies explored how mothers and preschoolers talk and reason about events in which biological and nonbiological objects change in size. Analysis of conversations indicated that although mothers discussed events primarily in domain-specific ways when using the term growth, they exhibited some domain blurring in explanations to preschoolers.…

Examined relationship between mother-child conversational interactions when children were 30, 36, and 42 months old and children's recall of these activities 1 day and 3 weeks later. Found that at all ages, features of activities jointly handled and jointly discussed were remembered better than features jointly handled but discussed by mother only…

Observed home interaction between parents and 2- and 4-year-olds at Time 1 and 2 years later. Found that parent mental state talk to children varied by child's age, context of talk, and parent gender. Four-year-olds with older siblings produced and heard more cognitive talk and less desire talk than children without older siblings. Time 1 family…