Researchers have demonstrated the association between difficult temperament in infancy and early childhood behavioral problems, but to date this has not been demonstrated in the child welfare population. This study utilized the National Survey of Child and Adolescent Well-Being (NSCAW), a nationally representative, longitudinal survey of children in the child-welfare system. The sample consisted of 1,084 infants 0-12 months old at baseline who were investigated for suspected child abuse. The researchers used longitudinal, multivariable logistic regression to examine the association between difficult temperament score in infants 0-12 months who had child welfare involvement and clinical-range Child Behavior Checklist (CBCL; Achenbach & Rescorla, 2000) score at 36-months-follow-up. Findings from this study suggest that among children with substantiated maltreatment, difficult temperament in infancy predicts early childhood behavioral problems. This relationship persists after adjusting for other risk factors, such as placement, caregiver depression, and family income. The study also discusses implications for child welfare practices.