Low-cost teacher-implemented intervention improves toddlers' language and math skills.

The first years of life are foundational for children’s cognitive and social–emotional development and to subsequent development in a variety of domains. In many countries, an increasing number of toddlers is enrolled in early childhood education (ECE) programs, which can facilitate early development. However, the quality of these programs is often mediocre. The present study represents a large-scale randomized control trial (87 childcare centers and 1116 toddlers) designed to elevate the quality of instruction in ECE programs serving toddlers. We show that a low-cost 20-week intervention providing teachers with sequence and scope and supportive tools to be more explicit and intentional in their interactions with children resulted in positive, mainly medium- to large-sized effects on targeted language and math skills.