This study assesses whether a 10-session intervention for maltreating parents effects the epigenome of young children who have experienced early maltreatment. Families are randomly assigned to the experimental condition (Attachment and Bioebehavioral Catch-Up) or a treatment control (Developmental Education for Families). Biological samples and behavioral observations of parenting will be collected pre- and post- intervention. Biological samples will be used to conduct whole genome analyses of differential DNA methylation that occur as a result of the intervention. Behavioral observations of parent-child interactions will be used to assess the efficacy of the intervention in altering parenting behaviors.