The specific aims of this study are to (1) Test the effectiveness of training community social welfare service providers in the use of attachment-based interventions by measuring their pre-training and post-training service provision strategies and interactions with maltreating families; (2) To test the effects of a relationship and attachment-based intervention with infants/toddlers of parents identified as maltreating by comparing them to a control group on rates of re-referral to CPS, severity of referral, and foster care placement; and (3) To conduct a test of the effectiveness of an attachment-based intervention on child well-being by comparing experimental and comparison groups on important outcomes (attachment security, emotional regulation, behavior, and developmental functioning).