“…This statement is supported by both biological evidence (the first 1,000 days of life, from conception, as a window of opportunity for nutritional interventions) and the literature on child psychology (sensitive periods for attachment or language development). Remarkably little information exists on the di erences in service quality parameters critical to the proper development of infants and toddlers, as compared to those required for preschoolers (Barros et al, 2011). Process variables, 2 which characterize the quality of child care routines and interactions between children and caregivers, become even more important for this age group.…”