As more women enter the workforce either as half or full time, it is now the norm in many societies for children to be placed in childcare before their first birthday. Because most of these children spend at least eight hours in childcare, we need to assess the quality of the service supplied by professional secondary caregivers (PSC). Maternal sensitivity is defined as mother’s ability to perceive and respond promptly and accurately to the child’s signals (Bowlby, 1969; Ainsworth, Blehar, Waters & Wall, 1978). The AQS (Waters, 1995) consists of 90 items describing attachment relevant infant behavior; the MBQS (Pederson & Moran, 1995) consists of 90 items describing maternal behavior. 34 child-PSC dyads were assessed in Mexican Social Security Child Care centers with the AQS and MBQS, to explore the factorial structure of sensitivity and secure base behaviors in Child Care facilities. The Child Care-adapted version of the AQS explains 52.99% of the variance (α=.69) and underlines the inconsistency of the relationship. The Professional Secondary Caregiver Q-Sort (PSCQS) explains the 45.35% of the variance (=.91) with few and less specific factors than those previously reported in the MBSQ.