This brief describes the social and emotional skills of children served by Migrant and Seasonal Head Start (MSHS) programs (see Box 1). This brief uses data from the MSHS Study 2017 (see Box 2) to examine the following questions: - Are MSHS children (infants, toddlers, and preschoolers) meeting their teachers' developmental expectations for social and emotional skills? - What are the social and emotional skills of MSHS toddlers (12 to 35 months)? - What are the social and emotional skills of MSHS preschoolers (36 months and older)? - What are the emotion and behavior regulation skills of MSHS preschoolers (36 months and older)? - How can MSHS programs support children's social and emotional skills? (author abstract)