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Objective: Children who have experienced maltreatment and subsequent placement in foster care are at increased risk for problem behavior. Increased knowledge of the development of problem behavior in this population, particularly during toddlerhood, can greatly inform preventive intervention efforts. This study examined variability in problem behavior among toddlers entering new foster care placements and identified related child and parenting characteristics.Method: Ninety-one toddlers in foster care (M = 2.26 years) and their caregivers completed an initial assessment and were reassessed six months later. Child general cognitive ability was assessed via performance on a standardized developmental measure, and child problem behavior, parenting stress, frequency of family routines, and harsh discipline were assessed via caregiver report.Results: Upon entering a new foster care placement and six months post-placement, respectively, 38% and 25% of the toddlers were within the borderline clinical or clinical range in terms of problem behavior when assessed using the Child Behavior Checklist. There was not a significant difference in problem behavior over this 6-month period, suggesting that problem behavior was quite stable among the toddlers as a group. However, general cognitive ability was a significant predictor of individual differences in change in problem behavior, with toddlers with lower general cognitive ability displaying increased problem behavior over this period. Conclusion:An elevated number of toddlers in foster care displayed clinically significant levels of problem behavior, further demonstrating that these children are an extremely high-risk group. The association between general cognitive ability and change in problem behavior highlights the importance of early developmental screenings, which may help to identify the children at greatest risk for problem behavior and most in need of preventive intervention efforts.

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The present study examined the psychometric properties of a brief parent-report daily checklist of toddler behavior (Parent Daily Report—Toddler Version; PDR-T). Data were collected from three groups of 18–36 month-olds who were followed longitudinally for approximately one year: (a) internationally adopted children ( N = 156); (b) children placed in foster care due to child maltreatment ( N = 79); and (c) community comparison children raised by their biological families ( N = 80). An exploratory factor analysis of this measure resulted in three factors, measuring aggressive/noncompliant, positive, and distress behaviors. While there were estimation issues with the positive and distress factors, the aggressive/noncompliant factor exhibited invariance across time and groups, and partial invariance between genders. Significant correlations were observed between this factor and measures of externalizing behavior and inhibitory control ( r = 0.26–0.56), but not shyness, fearfulness, or negative affect. This provides support for both convergent and discriminant validity. Reliability of this factor was adequate to good across time and group. Results provide preliminary support for the utility, reliability, and consistency of one factor of the PDR-T as an easy parent-report tool to assess daily patterns and changes in child aggressive/noncompliant behavior over time.