Children ages 2-5 begin developing their unique sense of self and recognize ethnic differences, though their exposure to other cultures is limited by caregivers. Cross-culturally adopted children do not differ in self-esteem or adjustment compared to same-race adoptees, and those adopted at a younger age tend to do better. Gender roles and identity form during this age, with notions of sex-typed play emerging at age 3 and gender stability by age 4. Poverty has negative effects, especially in the first 5 years, though programs like WIC, Head Start, and school nutrition programs can help mitigate impacts.