“…Second, due to children’s rapid development from age zero to five, the developmental, educational, and supervision needs of children below the age of three are quite different from those aged three to five, which is reflected in the staffing recommendations for centers serving these different age groups (Administration for Children & Families, 2022 ). Accordingly, there are different professional development needs for staff working with these age groups, as evidenced by previous work showing that educators serving infants and toddlers have differing experiences with PD compared to educators working with preschoolers (Gardner-Neblett et al, 2021 ). Finally, there has been increasing recent momentum behind providing universal PreK to children aged three and four in the United States (Fact Sheet: The American Families Plan, 2021 ), which would require a massive expansion of the early childhood workforce and their training needs to provide high-quality programming (Barnett, 2021 ), a daunting task given the current unequal distribution of high-quality early childhood options across the country (Gomez et al, 2015 ).…”