This chapter discusses the importance of taking a developmental perspective when educating infants and toddlers. It outlines four key developmental domains - physical, emotional, social, and cognitive/language - and explains how evaluating children in these areas can help teachers understand their strengths and needs. The chapter also reviews several influential developmental theories and trends in early childhood education, emphasizing the need to consider both universal patterns and individual differences in child development. Finally, it stresses the importance of respecting cultural diversity and partnering with families.